Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f5e9eaabc2a1b6…

MALICIOUS

PDF

34.3 KB Created: 2021-06-28 05:23:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a0053e43b6a9ccad04bb7d33fac929d2 SHA-1: 6e2e61fb8839402ba8c3fd292fdd9fbffc49ec8a SHA-256: 21f5e9eaabc2a1b61db7ff28671e0ddc4912785c4011cbded66d8b78b1f89b67
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that link to external resources, many of which are presented as cheats or hacks for games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier also flagged this PDF as malicious with high confidence.

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/roblox-super-hero-life-cheats-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/how-to-get-2021-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/hacks-para-roblox-murder-mystery-2-xp_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-font-free-download_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-got-free-item-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-robux-hack-tool-no-download_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/rxgate-cf-free-robux-redeem-code_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/pastebin-roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/spin-link_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-haiir-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-retail-tycoon-116-ifinite-money-hack_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-gold-cards-in-coin-master_GM406889139.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_off00002ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC1 22372 bytes
SHA-256: d7136247e5b269d3d81f8f372c3b678e2a2ff669a448bcd8924897695e6c5c09
font_01_sfnt_off00006065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6065 19192 bytes
SHA-256: 94e4141fcd62449361c10bebc940a2d1cc024d9f156a9dedfd4e2e4662970d46

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