I downloaded the APK and then used "Profile or Debug APK" under file in Android Studio and ctrl/cmd+shift+f to search for strings.
I don't know much about Android development or APKs but it's not exactly "reversing." from what I understand the profile/debug converts the .dex files from the APK to .smali which is human readable.
I took a look at the apk and noticed this in the manifest.
"com.blockeq.stellarwallet.WalletApplication"
Stellar Lumens is a fairly popular crypto currency.
I wonder if the app has built in support for crypto transactions. If not, maybe it's malware to mine crypto coins.
I don't know much about Android development or APKs but it's not exactly "reversing." from what I understand the profile/debug converts the .dex files from the APK to .smali which is human readable.