Modify SDK Version in APK
1. Decompile
apktool d malware.apk
2. Edit AndroidManifest.xml
mousepad malware/AndroidManifest.xml
Add the following inside the manifest:
<uses-sdk
android:minSdkVersion="23"
android:targetSdkVersion="23"
android:compileSdkVersion="23" />
3. Recompile
apktool b malware -o new_malware.apk
4. Sign
d2j-apk-sign new_malware.apk
5. Push to device
adb push new_malware-signed.apk /sdcard/