This is the chall description :

CHALL :

Given this image and check the file with file, binwalk, strings, pngcheck (because it’s a png file), and many more. But i can’t get anything with that, so i open forensically and i run error analysis check. Or if you don’t want do this manually, use stegsolve to solve it!

FLAG : CYCTF{l$b_st3g@n0gr@phy_f0r_th3_w1n}

Fin!