Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86c2934dd841622…

MALICIOUS

PDF

35.4 KB Created: 2021-06-25 19:20:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 55630e1fb80939c16b31de64cc39e691 SHA-1: c53e420ebe737e66a382d7374211d7ec16ff77c4 SHA-256: d86c2934dd84162259b2b60fcd8539701174730185a850fef88e561de88dd950
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous external links, many of which are SEO-optimized and point to resources related to game cheats and hacks, such as 'Free Robux Trainer'. This suggests a lure to download potentially malicious files or visit compromised websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-robux-trainer-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/what-is-the-april-1st-stickmasterluke-hack-face-roblox-called_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-make-your-own-roblox-hack-injector_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-hacks-4-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/tiktok-free-generator_GM835599320.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-jailbreak-money-hack-deutsch_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3358 22748 bytes
SHA-256: ad72c98725a52a35e93d1516589a02cb36c11c4c7b40dc97d214b113826fe52b
font_01_sfnt_off0000660e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660E 18836 bytes
SHA-256: 9f6bdfa9b1bc8d5486eb414ace2c8075d27aa2cf88b00e538ff3144532634e65

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