Malicious PDF — malware analysis report

Static analysis result for SHA-256 431d9ad8fc07cdb7…

MALICIOUS

PDF

35.8 KB Created: 2021-06-28 13:11:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4feeb6f898cbe8687a0fb1314aa41ea3 SHA-1: 547664b4584924f28a3ae9825d640fd4987b50a2 SHA-256: 431d9ad8fc07cdb76a07bc77b8ed78a9b1b9c9c8069e79199f124cadc9970c84
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are related to game hacks and free in-game currency, suggesting a lure for users to download potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-hack-tycoon-on-roblox-game-hack
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/free-robux-survey_GM431946152.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-followers-on-roblox_GM431946152.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/free-robux-quiz_GM431946152.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/coin-master-hacks-for-spins_GM406889139.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/get-free-robux-generator_GM431946152.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/minecraft-java-edition-free-download_GM479516143.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/roblox-speed-hack-youtube_GM431946152.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/archery-master-3d-unlimited-coins-hack_GM406889139.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/free-robux-2021_GM431946152.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-bit-ly_GM406889139.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-inspect_GM431946152.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/roblox-free-robux-no-verification_GM431946152.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-hack-2021_GM406889139.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/how-to-actually-get-free-robux_GM431946152.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link_GM406889139.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-apk-link_GM406889139.pdf
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/when-will-more-free-items-come-to-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000342e.bin
772f7a3ee3111877dd7b9d08041b0f69b8e5cf9b31fb410249c58fd79a94aaac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x342E 22700 bytes
font_01_sfnt_off00006705.bin
43d7a3de080f2edce60bd3f3840b9a8dc550c591bf06dbc3dc6058c4d5a83457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6705 19000 bytes

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