Primer paso de la investigacion. Se aportan el .apk, las carpetas con el apk extraido y el apk descompilado. El archivo API_DOCUMENTATION.md es un archivo donde se anotaran los descubrimientos del funcionamiento de la API, y los .py son scripts para probar la funcionalidad de la API con los métodos que vayamos encontrando. Finalmente, los archivos .js son scripts de Frida para extraer informacion de la APP durante la ejecucion.

apk_decompiled/sources/kotlin/internal/PlatformImplementations.java

@@ -0,0 +1,104 @@
+package kotlin.internal;
+
+import com.google.android.gms.measurement.api.AppMeasurementSdk;
+import java.lang.reflect.Method;
+import java.util.List;
+import java.util.regex.MatchResult;
+import kotlin.Metadata;
+import kotlin.collections.ArraysKt;
+import kotlin.collections.CollectionsKt;
+import kotlin.jvm.JvmField;
+import kotlin.jvm.internal.Intrinsics;
+import kotlin.jvm.internal.SourceDebugExtension;
+import kotlin.random.FallbackThreadLocalRandom;
+import kotlin.random.Random;
+import kotlin.text.MatchGroup;
+
+@Metadata(d1 = {"\u0000:\n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0002\b\u0002\n\u0002\u0010\u0002\n\u0000\n\u0002\u0010\u0003\n\u0002\b\u0002\n\u0002\u0018\u0002\n\u0000\n\u0002\u0018\u0002\n\u0000\n\u0002\u0018\u0002\n\u0000\n\u0002\u0010\u000e\n\u0000\n\u0002\u0010 \n\u0002\b\u0002\b\u0010\u0018\u00002\u00020\u0001:\u0001\u0012B\u0005¢\u0006\u0002\u0010\u0002J\u0018\u0010\u0003\u001a\u00020\u00042\u0006\u0010\u0005\u001a\u00020\u00062\u0006\u0010\u0007\u001a\u00020\u0006H\u0016J\b\u0010\b\u001a\u00020\tH\u0016J\u001a\u0010\n\u001a\u0004\u0018\u00010\u000b2\u0006\u0010\f\u001a\u00020\r2\u0006\u0010\u000e\u001a\u00020\u000fH\u0016J\u0016\u0010\u0010\u001a\b\u0012\u0004\u0012\u00020\u00060\u00112\u0006\u0010\u0007\u001a\u00020\u0006H\u0016¨\u0006\u0013"}, d2 = {"Lkotlin/internal/PlatformImplementations;", "", "()V", "addSuppressed", "", "cause", "", "exception", "defaultPlatformRandom", "Lkotlin/random/Random;", "getMatchResultNamedGroup", "Lkotlin/text/MatchGroup;", "matchResult", "Ljava/util/regex/MatchResult;", AppMeasurementSdk.ConditionalUserProperty.NAME, "", "getSuppressed", "", "ReflectThrowable", "kotlin-stdlib"}, k = 1, mv = {1, 9, 0}, xi = 48)
+@SourceDebugExtension({"SMAP\nPlatformImplementations.kt\nKotlin\n*S Kotlin\n*F\n+ 1 PlatformImplementations.kt\nkotlin/internal/PlatformImplementations\n+ 2 fake.kt\nkotlin/jvm/internal/FakeKt\n*L\n1#1,79:1\n1#2:80\n*E\n"})
+/* loaded from: classes3.dex */
+public class PlatformImplementations {
+
+    @Metadata(d1 = {"\u0000\u0014\n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0002\b\u0002\n\u0002\u0018\u0002\n\u0002\b\u0002\bÂ\u0002\u0018\u00002\u00020\u0001B\u0007\b\u0002¢\u0006\u0002\u0010\u0002R\u0012\u0010\u0003\u001a\u0004\u0018\u00010\u00048\u0006X\u0087\u0004¢\u0006\u0002\n\u0000R\u0012\u0010\u0005\u001a\u0004\u0018\u00010\u00048\u0006X\u0087\u0004¢\u0006\u0002\n\u0000¨\u0006\u0006"}, d2 = {"Lkotlin/internal/PlatformImplementations$ReflectThrowable;", "", "()V", "addSuppressed", "Ljava/lang/reflect/Method;", "getSuppressed", "kotlin-stdlib"}, k = 1, mv = {1, 9, 0}, xi = 48)
+    @SourceDebugExtension({"SMAP\nPlatformImplementations.kt\nKotlin\n*S Kotlin\n*F\n+ 1 PlatformImplementations.kt\nkotlin/internal/PlatformImplementations$ReflectThrowable\n+ 2 fake.kt\nkotlin/jvm/internal/FakeKt\n*L\n1#1,79:1\n1#2:80\n*E\n"})
+    /* loaded from: classes3.dex */
+    public static final class ReflectThrowable {
+        public static final ReflectThrowable INSTANCE = new ReflectThrowable();
+
+        @JvmField
+        public static final Method addSuppressed;
+
+        @JvmField
+        public static final Method getSuppressed;
+
+        static {
+            Method method;
+            Method method2;
+            Method[] methods = Throwable.class.getMethods();
+            Intrinsics.checkNotNull(methods);
+            int length = methods.length;
+            int i = 0;
+            int i4 = 0;
+            while (true) {
+                method = null;
+                if (i4 >= length) {
+                    method2 = null;
+                    break;
+                }
+                method2 = methods[i4];
+                if (Intrinsics.areEqual(method2.getName(), "addSuppressed")) {
+                    Class<?>[] parameterTypes = method2.getParameterTypes();
+                    Intrinsics.checkNotNullExpressionValue(parameterTypes, "getParameterTypes(...)");
+                    if (Intrinsics.areEqual(ArraysKt.singleOrNull(parameterTypes), Throwable.class)) {
+                        break;
+                    }
+                }
+                i4++;
+            }
+            addSuppressed = method2;
+            int length2 = methods.length;
+            while (true) {
+                if (i >= length2) {
+                    break;
+                }
+                Method method3 = methods[i];
+                if (Intrinsics.areEqual(method3.getName(), "getSuppressed")) {
+                    method = method3;
+                    break;
+                }
+                i++;
+            }
+            getSuppressed = method;
+        }
+
+        private ReflectThrowable() {
+        }
+    }
+
+    public void addSuppressed(Throwable cause, Throwable exception) {
+        Intrinsics.checkNotNullParameter(cause, "cause");
+        Intrinsics.checkNotNullParameter(exception, "exception");
+        Method method = ReflectThrowable.addSuppressed;
+        if (method != null) {
+            method.invoke(cause, exception);
+        }
+    }
+
+    public Random defaultPlatformRandom() {
+        return new FallbackThreadLocalRandom();
+    }
+
+    public MatchGroup getMatchResultNamedGroup(MatchResult matchResult, String name) {
+        Intrinsics.checkNotNullParameter(matchResult, "matchResult");
+        Intrinsics.checkNotNullParameter(name, "name");
+        throw new UnsupportedOperationException("Retrieving groups by name is not supported on this platform.");
+    }
+
+    public List<Throwable> getSuppressed(Throwable exception) {
+        Object invoke;
+        List<Throwable> asList;
+        Intrinsics.checkNotNullParameter(exception, "exception");
+        Method method = ReflectThrowable.getSuppressed;
+        return (method == null || (invoke = method.invoke(exception, new Object[0])) == null || (asList = ArraysKt.asList((Throwable[]) invoke)) == null) ? CollectionsKt.emptyList() : asList;
+    }
+}