Fc2-ppv-1864525 < TOP >

zsteg -a frames/frame_00123.png No obvious LSB payload. The audio track is often used for hidden data. 6.1 Convert audio to WAV ffmpeg -i audio.aac audio.wav 6.2 Spectrogram inspection sonogram -i audio.wav -o spectrogram.png # (or use Audacity → Analyze → Plot Spectrum) The spectrogram shows a faint pattern resembling Morse code near 10 s. 6.3 Extract Morse Export the 8–10 s slice:

00000000 66 6c 61 67 7b 46 43 32 5f 50 50 56 5f 31 38 36 |flag4525_fake......| ... fc2-ppv-1864525

# Get the offset of the final `moov` atom (e.g. 124,567,890) tail -c +124567891 fc2_1864525.mp4 > trailing.bin hexdump -C trailing.bin | head The dump shows plain ASCII: zsteg -a frames/frame_00123