Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e61522879aad24d…

MALICIOUS

PDF

34.8 KB Created: 2021-06-19 11:34:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a11964313c941269709b252f21a423ae SHA-1: 2493b21d9c19906b9f83b3727d1870ef002ea911 SHA-256: 6e61522879aad24d54de931e12bad3aae3e96c49df3adbead35f464f90592c1c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body that promotes free in-game currency and accounts for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users through search engines. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous links and the deceptive content strongly suggest a phishing or malware distribution 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.co/app/431946152/free-roblox-accounts-2021-july-game-hack
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/wwwcoin-master-free-spincom_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/robux-best_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-facebook_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/roblox-house-pets-free-vip_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-spins-for-coin-master-app_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/earn-free-robux-on-roblox_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-ios-no-human-verification_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/robloxheroxyz-free-robux_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-codes-2021_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-new-link-free-spin_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/500-free-spins-coin-master_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/promo-codes-make-robux-free-robux_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/pubg-70-uc_GM1330123889.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/robux-hack-free-robux_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-easy-and-fast_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-roblox-death-zone-glitch_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-spins-coin-master-links-blogger_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002dc3.bin
37a7b4746944b2f077733ae5012ff569d5e9ea91e14d2a9d7c043b383eb59548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2DC3 22840 bytes
font_01_sfnt_off0000612e.bin
75984da422dd55560a443fe97a9f0142cf8b3fbd46b38cff9082f39608e6ef6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612E 19640 bytes

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