Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1c919fcb7aa153…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 02:39:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e2a9a8b2a407f4d423cc57710d06a012 SHA-1: 725f434fc88e1376a32f6c8b8067320f4d91ce25 SHA-256: 7b1c919fcb7aa153392428da2d8f880fc6789502f2a6665be2af40bf8ab5cd78
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are SEO-optimized and point to sites offering 'free Roblox items' or 'hacks'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or traffic generation scheme. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or scam attempt designed to redirect users to potentially malicious websites.

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/431946152/free-roblox-clothes-2021-game-hack
    • http://lib.untad.ac.id/repository/how-to-fly-hack-in-roblox-phantom-forces_GM431946152.pdf
    • http://lib.untad.ac.id/repository/free-robux-codes-new_GM431946152.pdf
    • http://lib.untad.ac.id//repository/free-robux-easy-and-fast_GM431946152.pdf
    • http://lib.untad.ac.id/repository/how-to-get-free-roblox-gift-cards-2021_GM431946152.pdf
    • http://lib.untad.ac.id//repository/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • http://lib.untad.ac.id/repository/roblox-free-download-for-windows-8_GM431946152.pdf
    • http://lib.untad.ac.id/repository/cheats-in-wolves-life-3-roblox_GM431946152.pdf
    • http://lib.untad.ac.id/repository/free-robux-no-human-verification-or-survey-2021-real_GM431946152.pdf
    • http://lib.untad.ac.id/repository/hacker-roblox-video_GM431946152.pdf
    • http://lib.untad.ac.id/repository/free-black-hole-pack-roblox_GM431946152.pdf
    • http://lib.untad.ac.id/repository/hack-roblox-using-command-prompt_GM431946152.pdf
    • http://lib.untad.ac.id/repository/get-roblox-for-free_GM431946152.pdf
    • http://lib.untad.ac.id/repository/rbxcashcom-watch-videos-complete-offers-withdraw-to-robux-for-free_GM431946152.pdf
    • http://lib.untad.ac.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdf
    • http://lib.untad.ac.id/repository/try-minecraft-free_GM479516143.pdf
    • http://lib.untad.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdf
    • http://lib.untad.ac.id//repository/rbx-sites_GM431946152.pdf
    • http://lib.untad.ac.id/repository/coin-master-hack-with-lucky-patcher_GM406889139.pdf
    • http://lib.untad.ac.id/repository/hack-roblox-apk-2021_GM431946152.pdf
    • http://lib.untad.ac.id/repository/www-bandicam-com-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003060.bin
20a0603a44a884a3efc0682b3fc5767da5671905f88734178a5823ff94e5c327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3060 21912 bytes
font_01_sfnt_off0000607e.bin
86f15129a455bdcbd3c870b88480cf29a3086770cb270fee66b8f95c7ade4570		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 19320 bytes

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