Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dc5491957dc6a5…

MALICIOUS

PDF

44.4 KB Created: 2021-05-19 01:07:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 47e3795e20efd6d602d4aebcf70c8afc SHA-1: 2b2850f967d21460476485aed482302e2cd58af8 SHA-256: d8dc5491957dc6a5c20a9ea55a8dea0410b2ba219f882cc7ee7ec43cab62a9c2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, identified as a link farm, suggesting a tactic to drive traffic to potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to direct users to external resources, likely for SEO spam or to host further malicious content.

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 https://netcdn.xyz/app/835599320/tiktok-unlimited-free-trials-game-hack PDF link annotation
    • http://sbm-nn.ru/images/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-group_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/real-robux-codes_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-here_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
stream_003_off000050e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E5 25940 bytes
SHA-256: 4f9dc240b3bd7755110eb4fcac25f2f01c5b9fcbd185e9ed2698d16baffbe155
font_01_sfnt_off00008b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B41 18380 bytes
SHA-256: 86024d11789a0673282f750d45ca4b099e3febc4945001e7d544f1822de81e27

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