In this challenge an apk file is provided.
- Unziped the file
unzip mobpsycho.apk- From the files after unzip i ran find to see if there is any files with name flag
find mobpsycho -name '*flag*'Output
mobpsycho/res/color/flag.txt
- This file contains a hax string
7069636f4354467b6178386d433052553676655f4e5838356c346178386d436c5f37343664666133397d
- Decoding the hax string gives the flag
echo -n '7069636f4354467b6178386d433052553676655f4e5838356c346178386d436c5f37343664666133397d' | xxd -r -p
picoCTF{ax8mC0RU6ve_NX85l4ax8mCl_746dfa39}