Malicious PDF — malware analysis report

Static analysis result for SHA-256 3526c9d64dcb367d…

MALICIOUS

PDF

35.7 KB Created: 2021-07-04 01:19:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2880b1709c65d19cfd34454fd70686b4 SHA-1: 972146d6031069c87e884f1d99dd069074c58d87 SHA-256: 3526c9d64dcb367d71b6b1ac10bedc76a75b1cb5d962b8234c310bc88390d17c
102 Risk Score

Malware Insights

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

This PDF contains a large number of embedded links, many of which are SEO-optimized and point to sites offering "free spins" or "free robux." The presence of a "download button" heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful websites. The document's content and structure strongly suggest a lure for phishing or malware distribution.

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-free-spins-16-04-19-game-hack
    • http://lib.uho.ac.id/library/repository/how-to-hack-m-coins-mcpe-master_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/my-robux_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/how-to-hack-daimonds-on-roayale-high-in-roblox_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-2021-no-verification_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/rbxoffers-com-free-robux_GM431946152.pdf
    • http://lib.uho.ac.id/library//repository/blogspot-coin-master-free-spins_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdf
    • http://lib.uho.ac.id/library//repository/coin-master-hacks-that-actually-work_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/free-bedrock-minecraft_GM479516143.pdf
    • http://lib.uho.ac.id/library/repository/master-free-spin-and-coin-link_GM406889139.pdf
    • http://lib.uho.ac.id/library/repository/free-robux-survey_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/free-robux-generator-no-surveys-scam_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/how-to-get-free-unlimited-robux_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/how-to-hack-and-get-robux-and-vip-no-surve_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/roblox-moderators_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/free-robux-mod_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/ho2-to-get-free-robux_GM431946152.pdf
    • http://lib.uho.ac.id/library/repository/girl-roblox-avatar_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003374.bin
970abf559fb41da14c3c6007411a938f671e8a23dd29dd457a808531a702f921		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3374 23012 bytes
font_01_sfnt_off0000670b.bin
20d685e0a92dd782921121427ed45c9953f8581c82f4618ea276feb861e76f68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670B 18844 bytes

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