Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf1e445ef6d6927…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 11:59:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 30f06136405d940a2e9b446ecdebbe90 SHA-1: e29302ba86fb1bf3ad6a6ff8e09fffb7714bb803 SHA-256: 9cf1e445ef6d6927bdb7dd44bd9cc223c416ae68727291e21946656ad1876f11
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, many of which are hosted on suspicious domains and offer game-related cheats and hacks. The heuristic PDF_SEO_LINK_FARM indicates a large number of such links, suggesting a link farm designed to attract users with promises of free in-game items or software. The ML_NYX_PDF_MALICIOUS model also flagged this PDF with high confidence, supporting the malicious classification. The presence of a 'download' button lure further reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-games-download-free-game-hack
    • https://ifef.es/ckfinder/userfiles/files/free-robux-generator-without-verification_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-promo-codes-for-roblox-2021_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-100-spin-link_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-mods-in-minecraft_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-pc-free_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hacks-no-verification_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-spin-coin-master-twitter_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins-link_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hacks_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-coin-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/robux-generator-no-verification-2021_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/can-you-get-robux-for-free_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spin-and-coin-link-app_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-windows-10-hacks_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/will-minecraft-dungeons-be-free_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-online-hack-2021_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-cracked-minecraft-server-hosting_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004eb5.bin
75a6bf69979d9e1ecd62b381b34487594c39e8cbb79bcbcc9b5352ee96dd178c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EB5 24500 bytes
font_01_sfnt_off000085ca.bin
bf0010eea28238cadeb536793d42f80382de1e22dde51f6e5fd1d23f73abc266
pdf-font-stream PDF embedded font (sfnt) at offset 0x85CA 18548 bytes