UTCTF 2021 Forensic Sandwiched Write up

Sandwiched

 

binwalk로 확인 JPEG 파일 확인 가능. 0x1E90 ~ 0x9387 만큼 추출

b = open("h:/.Capture The Flag!/UTCTF 2021/Forensic/Sandwiched/secret.pdf", "rb").read()[0x1e90:0x9387]
r = open("h:/.Capture The Flag!/UTCTF 2021/Forensic/Sandwiched/flag.jpg", "wb").write(b)

utflag{file_sandwich_artist}