Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffd511228222276…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 06:16:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2d7e0ae7c441628888ffe97cfe611c62 SHA-1: 6a3ebd4b621a5f41bf992b86d0d0c8873c9c3df1 SHA-256: 4ffd511228222276662afbcdb010a1ef4a24e3ac1e2421b75035486b2e585401
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm, all pointing to sites offering 'free spins' or 'free robux', which is a common lure for scams and potentially malicious downloads. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to generate SEO traffic for these scam-related links. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/free-spins-and-coins-coin-master-2021-link-game-hack
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-without-verification-for-iphone_GM406889139.pdf
    • https://fib.ub.ac.id/sac//repository/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-free-robux-quiz_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/free-roblox-shirt-templates-2021_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/how-to-get-obc-in-roblox-for-free-2021_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/daily-free-spins-on-coin-master_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/100-working-free-robux-hack_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-ios-free-robux_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/robux-max-limit-roblox-free_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spin-and-trading-group_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/free-robux-obby-roblox-game-real_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/get-free-robux-no-human-verification-real_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/free-20210-robux_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/hack-coin-master-apk-ios_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/free-robux-generator-100-working_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/cheat-engine-undetected-roblox_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/i-need-more-free-spins-on-coin-master_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/how-to-hack-roblox-assassin_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002ff8.bin
c9b1488726218005757bb650b44d871ed5fd3c2ac735dfbcc702e99874f2269c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FF8 22544 bytes
font_01_sfnt_off00006290.bin
5da8567ac5cad1a9e8b19f4308895a295b9244689bea2bda45786747592bc9c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6290 18920 bytes

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