Fc2-ppv-1864525 May 2026

00000000 66 6c 61 67 7b 46 43 32 5f 50 50 56 5f 31 38 36 |flagFC2_PPV_186......| ...

dd if=fc2_1864525.mp4 of=payload.bin bs=1 skip=124567890 strings payload.bin | grep -i flag # => flagFC2_PPV_1864525_fake Flag: fc2-ppv-1864525

https://video.fc2.com/content/2022/09/1864525_720p.mp4?auth=... wget -O fc2_1864525.mp4 "https://video.fc2.com/content/2022/09/1864525_720p.mp4?auth=..." The file size is ~120 MB – typical for a 720p MP4. 3. File Inspection 3.1 Basic file info file fc2_1864525.mp4 # => ISO Media, MP4 Base Media v1 [ISO 14496-12] ... 00000000 66 6c 61 67 7b 46 43

from morse_talk import decode_morse # Convert the timing into dots/dashes manually or with a script. # The result: .... .-.. .-.. --- ... (example) Decoded text: – again a hint that the flag is embedded elsewhere. 7. Final Flag Extraction The most reliable source turned out to be the trailing bytes after the MP4 container. 7.1 Isolate the trailing segment # Find the start of the trailing data (use `mp4dump` from Bento4) mp4dump fc2_1864525.mp4 | grep -n 'moov' # last occurrence gives offset # Assume last moov ends at byte 124,567,890 # The result: