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/jdk8/JDK8PlatformImplementations.java

@@ -0,0 +1,82 @@
+package kotlin.internal.jdk8;
+
+import com.google.android.gms.measurement.api.AppMeasurementSdk;
+import com.google.firebase.remoteconfig.RemoteConfigConstants;
+import java.util.regex.MatchResult;
+import java.util.regex.Matcher;
+import kotlin.Metadata;
+import kotlin.internal.jdk7.JDK7PlatformImplementations;
+import kotlin.jvm.JvmField;
+import kotlin.jvm.internal.Intrinsics;
+import kotlin.jvm.internal.SourceDebugExtension;
+import kotlin.random.Random;
+import kotlin.random.jdk8.PlatformThreadLocalRandom;
+import kotlin.ranges.IntRange;
+import kotlin.text.MatchGroup;
+
+@Metadata(d1 = {"\u00002\n\u0002\u0018\u0002\n\u0002\u0018\u0002\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\u000b\n\u0000\n\u0002\u0010\b\n\u0002\b\u0002\b\u0010\u0018\u00002\u00020\u0001:\u0001\u000fB\u0005¢\u0006\u0002\u0010\u0002J\b\u0010\u0003\u001a\u00020\u0004H\u0016J\u001a\u0010\u0005\u001a\u0004\u0018\u00010\u00062\u0006\u0010\u0007\u001a\u00020\b2\u0006\u0010\t\u001a\u00020\nH\u0016J\u0010\u0010\u000b\u001a\u00020\f2\u0006\u0010\r\u001a\u00020\u000eH\u0002¨\u0006\u0010"}, d2 = {"Lkotlin/internal/jdk8/JDK8PlatformImplementations;", "Lkotlin/internal/jdk7/JDK7PlatformImplementations;", "()V", "defaultPlatformRandom", "Lkotlin/random/Random;", "getMatchResultNamedGroup", "Lkotlin/text/MatchGroup;", "matchResult", "Ljava/util/regex/MatchResult;", AppMeasurementSdk.ConditionalUserProperty.NAME, "", "sdkIsNullOrAtLeast", "", "version", "", "ReflectSdkVersion", "kotlin-stdlib-jdk8"}, k = 1, mv = {1, 9, 0}, xi = 48)
+/* loaded from: classes3.dex */
+public class JDK8PlatformImplementations extends JDK7PlatformImplementations {
+
+    @Metadata(d1 = {"\u0000\u0014\n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0002\b\u0002\n\u0002\u0010\b\n\u0002\b\u0002\bÂ\u0002\u0018\u00002\u00020\u0001B\u0007\b\u0002¢\u0006\u0002\u0010\u0002R\u0014\u0010\u0003\u001a\u0004\u0018\u00010\u00048\u0006X\u0087\u0004¢\u0006\u0004\n\u0002\u0010\u0005¨\u0006\u0006"}, d2 = {"Lkotlin/internal/jdk8/JDK8PlatformImplementations$ReflectSdkVersion;", "", "()V", RemoteConfigConstants.RequestFieldKey.SDK_VERSION, "", "Ljava/lang/Integer;", "kotlin-stdlib-jdk8"}, k = 1, mv = {1, 9, 0}, xi = 48)
+    @SourceDebugExtension({"SMAP\nJDK8PlatformImplementations.kt\nKotlin\n*S Kotlin\n*F\n+ 1 JDK8PlatformImplementations.kt\nkotlin/internal/jdk8/JDK8PlatformImplementations$ReflectSdkVersion\n+ 2 fake.kt\nkotlin/jvm/internal/FakeKt\n*L\n1#1,61:1\n1#2:62\n*E\n"})
+    /* loaded from: classes3.dex */
+    public static final class ReflectSdkVersion {
+        public static final ReflectSdkVersion INSTANCE = new ReflectSdkVersion();
+
+        @JvmField
+        public static final Integer sdkVersion;
+
+        static {
+            Integer num;
+            Object obj;
+            Integer num2 = null;
+            try {
+                obj = Class.forName("android.os.Build$VERSION").getField("SDK_INT").get(null);
+            } catch (Throwable unused) {
+            }
+            if (obj instanceof Integer) {
+                num = (Integer) obj;
+                if (num != null && num.intValue() > 0) {
+                    num2 = num;
+                }
+                sdkVersion = num2;
+            }
+            num = null;
+            if (num != null) {
+                num2 = num;
+            }
+            sdkVersion = num2;
+        }
+
+        private ReflectSdkVersion() {
+        }
+    }
+
+    private final boolean sdkIsNullOrAtLeast(int version) {
+        Integer num = ReflectSdkVersion.sdkVersion;
+        return num == null || num.intValue() >= version;
+    }
+
+    @Override // kotlin.internal.PlatformImplementations
+    public Random defaultPlatformRandom() {
+        return sdkIsNullOrAtLeast(34) ? new PlatformThreadLocalRandom() : super.defaultPlatformRandom();
+    }
+
+    @Override // kotlin.internal.PlatformImplementations
+    public MatchGroup getMatchResultNamedGroup(MatchResult matchResult, String name) {
+        Intrinsics.checkNotNullParameter(matchResult, "matchResult");
+        Intrinsics.checkNotNullParameter(name, "name");
+        Matcher matcher = matchResult instanceof Matcher ? (Matcher) matchResult : null;
+        if (matcher == null) {
+            throw new UnsupportedOperationException("Retrieving groups by name is not supported on this platform.");
+        }
+        IntRange intRange = new IntRange(matcher.start(name), matcher.end(name) - 1);
+        if (intRange.getStart().intValue() < 0) {
+            return null;
+        }
+        String group = matcher.group(name);
+        Intrinsics.checkNotNullExpressionValue(group, "group(...)");
+        return new MatchGroup(group, intRange);
+    }
+}