Malicious PDF — malware analysis report

Static analysis result for SHA-256 36be696fbce12f2f…

MALICIOUS

PDF

46.6 KB Created: 2021-06-09 09:41:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f0212cd98f91cb1694d36a902f210131 SHA-1: 21e0656d711e78ac7425d4a228ca79f54536a28a SHA-256: 36be696fbce12f2fe91869622ee59f2df74bf4d9f3f9adb4708d176d55d2c881
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/gain.bux-gain-free-robux-game-hack PDF link annotation
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/coin-master-today_GM406889139.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000531f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x531F 28336 bytes
SHA-256: 40cd1971cf3b228254aced302977bb178482d9111e2c01ba10f6fc8bfe6ca84f
font_01_sfnt_off0000933c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x933C 18428 bytes
SHA-256: fcdb7a745b26e7dd0a7228d14486442da579ea4109c3e327f5b6253a940c9753

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