Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf40fe52f9210d8c…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 05:48:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 319aae501eed900c54f57ab19d4ebcb1 SHA-1: 9f44ba188aaf05d79665678059039135354f9fab SHA-256: bf40fe52f9210d8cbc911f7267748099e0e327353724a856acff50235aea8875
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm designed to attract users searching for 'free Robux'. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a 'download button' lure further supports a malicious intent. The document likely serves as a lure to drive traffic to these external sites, which may host further malicious content or scams.

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-robux-without-survey-game-hack
    • http://library.itekes-bali.ac.id/repository/clean-master-hack-coins_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/roblox-ninja-simulator-2-cheat-engine_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/800-free-robux-ad_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/can-u-get-free-robux_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/how-to-free-robux-november-2021_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/free-robux-no-offers-2021_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/how-to-make-clothes-without-hacks-or-bc-roblox_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/robux-hack-without-verification-or-survey_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/nero-cheat-codes-roblox-audio_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/daily-free-spins-coin-master-app_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/follower-generator-free-roblox_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/apps-for-free-robux_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/roblox-groups-that-give-you-free-robux_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/minecraft-toolbox-premium-apk_GM479516143.pdf
    • http://library.itekes-bali.ac.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/coin-master-cheat-engine-hack_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/free-gold-cards-for-coin-master_GM406889139.pdf
    • http://library.itekes-bali.ac.id/repository/free-robux-codes-download_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/how-do-i-get-free-builders-club-on-roblox_GM431946152.pdf
    • http://library.itekes-bali.ac.id/repository/coin-master-links-for-free-spins-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003171.bin
fad1059f5fbe7984f6038a62ce41523efd216095a110360323ddd90937296610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3171 21984 bytes
font_01_sfnt_off000061f2.bin
ea618dc0ac89057573f0900fc77451ab5142be89e827617cc4892c329dfdb229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F2 19600 bytes

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