Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c636c75d57af9d2…

MALICIOUS

PDF

45.1 KB Created: 2021-06-07 17:06:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c94897cbb414b0d8b2407078fa390d03 SHA-1: 8a52e3bc96cc08616fb6a6002bc7dd063e302cf0 SHA-256: 8c636c75d57af9d239dc40eae75cc6e24bdd366d4f57ecfc9d02890c5feb4749
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO spamming technique. The document body, though partially corrupted, contains a URL related to game cheats, suggesting a lure. The presence of numerous external links and the ML classifier's high confidence score support the assessment of 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.tw/app/431946152/how-to-throw-walls-in-roblox-ith-cheat-game-hack PDF link annotation
    • http://legs11.co.za/images/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-get-a-free-roblox-gift-car_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/free-roblox-games-for-guest_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://legs11.co.za/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/roblox-spin-hack_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • http://legs11.co.za/images/free-spins-and-coins-coin-master-link-2021_GM406889139.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_off00004ea4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA4 27596 bytes
SHA-256: 0e471be480104689bedc6a3ee947b69b91252efb833b25495de466a81da8c601
font_01_sfnt_off00008c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C93 18644 bytes
SHA-256: 9e7d358f0398c4a69a58ab62d8581c5333e9dca10741e80304dfa60bcf55b57d

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