timer

wget https://artifacts.picoctf.net/c/449/timer.apk

First I downloaded jadx. You can also use mobsf if you want.

Steps to install jadx:

Installing Java:

sudo apt install default-jre
sudo apt install default-jdk

Installing Git:

sudo apt install git

Installing JADX:

git clone https://github.com/skylot/jadx.git
cd jadx
./gradlew dist
alias jadx-gui=’~/<directoryName>/jadx/build/jadx/bin/jadx-gui’
cd ..

Using JADX:

jadx-gui timer.apk

That command starts jadx. Once it is started you go to file then open where you open timer.apk at the file location. Then you go to navigation then search. I put "pico" to start and saw the flag at the start of my search. You could also do "picoCTF{" in the search to have it give less results.

Flag: picoCTF{t1m3r_r3...496}