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/s3/k.java

@@ -0,0 +1,71 @@
+package s3;
+
+import java.io.IOException;
+import kotlin.Unit;
+import kotlin.jvm.functions.Function2;
+import kotlin.jvm.internal.Lambda;
+import kotlin.jvm.internal.Ref;
+import r3.C;
+
+/* loaded from: classes3.dex */
+public final class k extends Lambda implements Function2 {
+
+    /* renamed from: a, reason: collision with root package name */
+    public final /* synthetic */ C f8502a;
+
+    /* renamed from: b, reason: collision with root package name */
+    public final /* synthetic */ Ref.ObjectRef f8503b;
+
+    /* renamed from: c, reason: collision with root package name */
+    public final /* synthetic */ Ref.ObjectRef f8504c;
+
+    /* renamed from: d, reason: collision with root package name */
+    public final /* synthetic */ Ref.ObjectRef f8505d;
+
+    /* JADX WARN: 'super' call moved to the top of the method (can break code semantics) */
+    public k(C c4, Ref.ObjectRef objectRef, Ref.ObjectRef objectRef2, Ref.ObjectRef objectRef3) {
+        super(2);
+        this.f8502a = c4;
+        this.f8503b = objectRef;
+        this.f8504c = objectRef2;
+        this.f8505d = objectRef3;
+    }
+
+    /* JADX WARN: Type inference failed for: r0v11, types: [T, java.lang.Long] */
+    /* JADX WARN: Type inference failed for: r0v7, types: [T, java.lang.Long] */
+    /* JADX WARN: Type inference failed for: r12v9, types: [T, java.lang.Long] */
+    @Override // kotlin.jvm.functions.Function2
+    public final Object invoke(Object obj, Object obj2) {
+        int intValue = ((Number) obj).intValue();
+        long longValue = ((Number) obj2).longValue();
+        if (intValue == 21589) {
+            if (longValue < 1) {
+                throw new IOException("bad zip: extended timestamp extra too short");
+            }
+            byte readByte = this.f8502a.readByte();
+            boolean z3 = (readByte & 1) == 1;
+            boolean z4 = (readByte & 2) == 2;
+            boolean z5 = (readByte & 4) == 4;
+            long j4 = z3 ? 5L : 1L;
+            if (z4) {
+                j4 += 4;
+            }
+            if (z5) {
+                j4 += 4;
+            }
+            if (longValue < j4) {
+                throw new IOException("bad zip: extended timestamp extra too short");
+            }
+            if (z3) {
+                this.f8503b.element = Long.valueOf(r2.x() * 1000);
+            }
+            if (z4) {
+                this.f8504c.element = Long.valueOf(r2.x() * 1000);
+            }
+            if (z5) {
+                this.f8505d.element = Long.valueOf(r2.x() * 1000);
+            }
+        }
+        return Unit.INSTANCE;
+    }
+}