Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7994800055bd42e…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 11:35:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 33d3c48f6ce89e446a1fb8f5d379c157 SHA-1: 32ffbcd15cec66df5dee30a18bd2d28a160fe825 SHA-256: c7994800055bd42ee0b5866fea45e8f85c99b964d4d5ef46e2fbf07513a0b8e2
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to websites offering game hacks and cheats for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO abuse tactic. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful content.

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.tw/app/406889139/coin-master-apk-hacked-3526-game-hack PDF link annotation
    • https://lib.unitri.ac.id/repository/what-is-the-code-for-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/my-roblox-girlfriend-cheated-on-me_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-promo-codes20219-for-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-recover-hacked-account_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-advanced-builder-in-bloxburg-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/best-meliodas-roblox-face-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/robux-cheat-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-hacks-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/best-free-roblox-items-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/apocalypse-rising-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/robux-best_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
font_00_sfnt_off00002f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6D 22440 bytes
SHA-256: e43c4de9e716f1a349379c13748fd2cde7c2e50e94b12c1b65b4e4a0b29d2736
font_01_sfnt_off00006188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6188 18952 bytes
SHA-256: cc64386860e28c7a5bda04069eb4bd080ed1959d90d23f8bc3188d8a17878c18

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