Hmmm
Description
🤔
Note: anime girl isn't the flag
(linked binary: "hmmm")
Solution
The binary contains a flag at the beginning: hexCTF{1m_s0rry_1f_y0u_r3v3r5ed_7h1s}
It prints out an image with Unicode Braille:
⢸⣿⣿⣿⣿⠃⠄⢀⣴⡾⠃⠄⠄⠄⠄⠄⠈⠺⠟⠛⠛⠛⠛⠻⢿⣿⣿⣿⣿⣶⣤⡀⠄
⢸⣿⣿⣿⡟⢀⣴⣿⡿⠁⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⣸⣿⣿⣿⣿⣿⣿⣿⣷
⢸⣿⣿⠟⣴⣿⡿⡟⡼⢹⣷⢲⡶⣖⣾⣶⢄⠄⠄⠄⠄⠄⢀⣼⣿⢿⣿⣿⣿⣿⣿⣿⣿
⢸⣿⢫⣾⣿⡟⣾⡸⢠⡿⢳⡿⠍⣼⣿⢏⣿⣷⢄⡀⠄⢠⣾⢻⣿⣸⣿⣿⣿⣿⣿⣿⣿
⡿⣡⣿⣿⡟⡼⡁⠁⣰⠂⡾⠉⢨⣿⠃⣿⡿⠍⣾⣟⢤⣿⢇⣿⢇⣿⣿⢿⣿⣿⣿⣿⣿
⣱⣿⣿⡟⡐⣰⣧⡷⣿⣴⣧⣤⣼⣯⢸⡿⠁⣰⠟⢀⣼⠏⣲⠏⢸⣿⡟⣿⣿⣿⣿⣿⣿
⣿⣿⡟⠁⠄⠟⣁⠄⢡⣿⣿⣿⣿⣿⣿⣦⣼⢟⢀⡼⠃⡹⠃⡀⢸⡿⢸⣿⣿⣿⣿⣿⡟
⣿⣿⠃⠄⢀⣾⠋⠓⢰⣿⣿⣿⣿⣿⣿⠿⣿⣿⣾⣅⢔⣕⡇⡇⡼⢁⣿⣿⣿⣿⣿⣿⢣
⣿⡟⠄⠄⣾⣇⠷⣢⣿⣿⣿⣿⣿⣿⣿⣭⣀⡈⠙⢿⣿⣿⡇⡧⢁⣾⣿⣿⣿⣿⣿⢏⣾
⣿⡇⠄⣼⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠟⢻⠇⠄⠄⢿⣿⡇⢡⣾⣿⣿⣿⣿⣿⣏⣼⣿
⣿⣷⢰⣿⣿⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⢰⣧⣀⡄⢀⠘⡿⣰⣿⣿⣿⣿⣿⣿⠟⣼⣿⣿
⢹⣿⢸⣿⣿⠟⠻⢿⣿⣿⣿⣿⣿⣿⣿⣶⣭⣉⣤⣿⢈⣼⣿⣿⣿⣿⣿⣿⠏⣾⣹⣿⣿
⢸⠇⡜⣿⡟⠄⠄⠄⠈⠙⣿⣿⣿⣿⣿⣿⣿⣿⠟⣱⣻⣿⣿⣿⣿⣿⠟⠁⢳⠃⣿⣿⣿
⠄⣰⡗⠹⣿⣄⠄⠄⠄⢀⣿⣿⣿⣿⣿⣿⠟⣅⣥⣿⣿⣿⣿⠿⠋⠄⠄⣾⡌⢠⣿⡿⠃
⠜⠋⢠⣷⢻⣿⣿⣶⣾⣿⣿⣿⣿⠿⣛⣥⣾⣿⠿⠟⠛⠉⠄⠄
I first thought I had to reverse it, because it wouldn't show up in strings
for some reason.