Malicious PDF — malware analysis report

Static analysis result for SHA-256 253f6d34490f9d04…

MALICIOUS

PDF

42.3 KB Created: 2021-05-16 04:37:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4a5bf3a45505c2fc1aa048afe4a75b92 SHA-1: 7ae2d530b07ff906e32b6618f2bf374999bd982d SHA-256: 253f6d34490f9d045d3ee44f2e1e39ac4efc3140e130b5412c853bd0b1264568
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many of which are SEO-optimized PDF files related to games and hacks, suggesting a link farm designed to attract traffic. The presence of a 'download button' heuristic and a high ML confidence score further indicate malicious intent. The document likely serves as a lure to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/479516143/minecraft-pvp-hacks-game-hack
    • http://firstaidacademy.be/images/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://firstaidacademy.be/images/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdf
    • http://firstaidacademy.be/images/free-robux-no-verification-no-survey_GM431946152.pdf
    • http://firstaidacademy.be/images/how-to-get-free-spins-grom-coin-master_GM406889139.pdf
    • http://firstaidacademy.be/images/how-to-install-minecraft-for-free_GM479516143.pdf
    • http://firstaidacademy.be/images/how-to-hack-coin-master-without-root_GM406889139.pdf
    • http://firstaidacademy.be/images/coin-master-hack-ios-reddit_GM406889139.pdf
    • http://firstaidacademy.be/images/how-to-hack-coin-master-spin-ios_GM406889139.pdf
    • http://firstaidacademy.be/images/free-coins-coin-master-2021_GM406889139.pdf
    • http://firstaidacademy.be/images/free-minecraft-client_GM479516143.pdf
    • http://firstaidacademy.be/images/oprewards-robux_GM431946152.pdf
    • http://firstaidacademy.be/images/roblox-fun-com-free-robux_GM431946152.pdf
    • http://firstaidacademy.be/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdf
    • http://firstaidacademy.be/images/free-coin-master-spins-blogger_GM406889139.pdf
    • http://firstaidacademy.be/images/hack-coin-master-net_GM406889139.pdf
    • http://firstaidacademy.be/images/coin-master-hack-2021-apk_GM406889139.pdf
    • http://firstaidacademy.be/images/mangocheats-com-hack-coin-master-cheat_GM406889139.pdf
    • http://firstaidacademy.be/images/coin-master-heaven-free-spins-today_GM406889139.pdf
    • http://firstaidacademy.be/images/coin-master-free-spins-2021_GM406889139.pdf
    • http://firstaidacademy.be/images/coin-master-free-coins-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a07.bin
7195637e94acb2258a1775b892d4e07a5e0840af709826a5aa9c7c27372b8f45
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A07 25424 bytes
font_01_sfnt_off00008377.bin
0e2f0ac061c68c7eb9671630210144f167660a9976ef74b494f6c2985e791cfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x8377 18180 bytes