Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbd2971ce983dfa…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 03:48:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b95fd7c54cce1e3a14c99575adcc8282 SHA-1: afad600f240bcd02ecaa3bd7e6965d977c2f61be SHA-256: ffbd2971ce983dfafd13705b82ae1fe1fbee8f0aefff77e08c09191b40a767bc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a document body that promotes free in-game currency and hacks for games like Robux and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the lures point towards a phishing or scam attempt.

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/bux-free-robux-game-hack
    • http://elibrary.uinbanten.ac.id/repository/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdf
    • http://elibrary.uinbanten.ac.id/repository/coin-master-free-spins-hack-ios_GM406889139.pdf
    • http://elibrary.uinbanten.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://elibrary.uinbanten.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://elibrary.uinbanten.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdf
    • http://elibrary.uinbanten.ac.id/repository/game-hack-coin-master_GM406889139.pdf
    • http://elibrary.uinbanten.ac.id/repository/free-meeting-center-roblox_GM431946152.pdf
    • http://elibrary.uinbanten.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • http://elibrary.uinbanten.ac.id/repository/how-do-u-hack-accounts-roblox_GM431946152.pdf
    • http://elibrary.uinbanten.ac.id/repository/coin-master-download-hack_GM406889139.pdf
    • http://elibrary.uinbanten.ac.id/repository/free-workink-downloadable-roblox-avatars_GM431946152.pdf
    • http://elibrary.uinbanten.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://elibrary.uinbanten.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdf
    • http://elibrary.uinbanten.ac.id/repository/top-10-roblox-groups-for-free-robux_GM431946152.pdf
    • http://elibrary.uinbanten.ac.id/repository/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdf
    • http://elibrary.uinbanten.ac.id/repository/tete-de-roblox-free-to-use_GM431946152.pdf
    • http://elibrary.uinbanten.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdf
    • http://elibrary.uinbanten.ac.id/repository/case-clicker-case-hack-roblox_GM431946152.pdf
    • http://elibrary.uinbanten.ac.id/repository/coin-master-reward-link_GM406889139.pdf
    • http://elibrary.uinbanten.ac.id/repository/bloxland-earn-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_off000030eb.bin
99c0bc5d23aae89631f8013dae3086d023739bfb4c6632696efe2504cac2f2f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30EB 21960 bytes
font_01_sfnt_off0000616e.bin
387288f024d8c8f54f23c256e97e071e9b3801b919dc08d0a5cbca9b70f610f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616E 18716 bytes

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