Malicious PDF — malware analysis report

Static analysis result for SHA-256 1396110be8db933a…

MALICIOUS

PDF

46.1 KB Created: 2021-05-17 14:31:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e3418145c56b264d3e0a3167fe7638f8 SHA-1: af7fdec3ea4b2a8f3b5023d7e8b91c1076e45dad SHA-256: 1396110be8db933aacbba2c335ad676f1a1ab89925b5831f77ef7009ddc64220
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized to appear as legitimate sources for game cheats and free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/406889139/moonactive-coin-master-free-spins-link-game-hack PDF link annotation
    • http://colsaf.co/images/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://colsaf.co/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://colsaf.co/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://colsaf.co/images/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://colsaf.co/images/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://colsaf.co/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://colsaf.co/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://colsaf.co/images/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://colsaf.co/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://colsaf.co/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://colsaf.co/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a6c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6C 24964 bytes
SHA-256: 40a618dfbfdd1d8b9303f211a4bb44ed09d5ad9d1947f8868e57921525393d51
font_01_sfnt_off00008442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8442 4084 bytes
SHA-256: df85173feea72dc2f2189124c35b140faf44ef7a36f3496b492965e474480a3b
font_02_sfnt_off00009200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9200 18168 bytes
SHA-256: 5140a57a6990af64b86c6fc328de463115c3f290c56e1373822c3feaa5dc4a97

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