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/r3/u.java

@@ -0,0 +1,104 @@
+package r3;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InterruptedIOException;
+import java.io.RandomAccessFile;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Logger;
+import kotlin.collections.CollectionsKt;
+import kotlin.jvm.internal.Intrinsics;
+
+/* loaded from: classes3.dex */
+public class u extends n {
+    @Override // r3.n
+    public final void a(z path) {
+        Intrinsics.checkNotNullParameter(path, "path");
+        if (Thread.interrupted()) {
+            throw new InterruptedIOException("interrupted");
+        }
+        File e4 = path.e();
+        if (e4.delete() || !e4.exists()) {
+            return;
+        }
+        throw new IOException("failed to delete " + path);
+    }
+
+    @Override // r3.n
+    public final List d(z dir) {
+        Intrinsics.checkNotNullParameter(dir, "dir");
+        File e4 = dir.e();
+        String[] list = e4.list();
+        if (list == null) {
+            if (e4.exists()) {
+                throw new IOException("failed to list " + dir);
+            }
+            throw new FileNotFoundException("no such file: " + dir);
+        }
+        ArrayList arrayList = new ArrayList();
+        for (String str : list) {
+            Intrinsics.checkNotNull(str);
+            arrayList.add(dir.d(str));
+        }
+        CollectionsKt.sort(arrayList);
+        Intrinsics.checkNotNull(arrayList);
+        return arrayList;
+    }
+
+    @Override // r3.n
+    public m f(z path) {
+        Intrinsics.checkNotNullParameter(path, "path");
+        File e4 = path.e();
+        boolean isFile = e4.isFile();
+        boolean isDirectory = e4.isDirectory();
+        long lastModified = e4.lastModified();
+        long length = e4.length();
+        if (!isFile && !isDirectory && lastModified == 0 && length == 0 && !e4.exists()) {
+            return null;
+        }
+        return new m(isFile, isDirectory, null, Long.valueOf(length), null, Long.valueOf(lastModified), null);
+    }
+
+    /* JADX WARN: Type inference failed for: r3v3, types: [java.lang.Object, r3.K] */
+    @Override // r3.n
+    public final G g(z file) {
+        Intrinsics.checkNotNullParameter(file, "file");
+        File e4 = file.e();
+        Logger logger = w.f8315a;
+        Intrinsics.checkNotNullParameter(e4, "<this>");
+        FileOutputStream fileOutputStream = new FileOutputStream(e4, false);
+        Intrinsics.checkNotNullParameter(fileOutputStream, "<this>");
+        return new y(fileOutputStream, new Object());
+    }
+
+    @Override // r3.n
+    public final I h(z file) {
+        Intrinsics.checkNotNullParameter(file, "file");
+        File e4 = file.e();
+        Logger logger = w.f8315a;
+        Intrinsics.checkNotNullParameter(e4, "<this>");
+        return new C0572d(new FileInputStream(e4), K.f8261d);
+    }
+
+    public void i(z source, z target) {
+        Intrinsics.checkNotNullParameter(source, "source");
+        Intrinsics.checkNotNullParameter(target, "target");
+        if (source.e().renameTo(target.e())) {
+            return;
+        }
+        throw new IOException("failed to move " + source + " to " + target);
+    }
+
+    public final t j(z file) {
+        Intrinsics.checkNotNullParameter(file, "file");
+        return new t(new RandomAccessFile(file.e(), "r"));
+    }
+
+    public String toString() {
+        return "JvmSystemFileSystem";
+    }
+}