Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0328eaa6f01db39…

MALICIOUS

PDF

34.7 KB Created: 2021-06-17 20:48:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d6b55c98a8bc56f1dbf4f26ce3430bc1 SHA-1: 05482cd609d1e0d0b790f972ac84f8aa64766c69 SHA-256: d0328eaa6f01db39243801ef8ecaed83461cf4c602136683eb4758406c87475c
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 hosted on sbm-nn.ru and appear to be part of a link farm designed to attract users searching for game cheats and free virtual currency. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a call-to-action phrase further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted from this sample.

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/husky-800m-free-robux-game-hack PDF link annotation
    • http://sbm-nn.ru/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/robux-hack-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-roblox-accounts-with-robux-and-obc-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/cringe-guys-trying-to-have-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/cheat-roblox-lumber-tycoon-2-engine_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/izuku-midoriya-roblox-free-schop_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-cheat-in-roblox-bad-business_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/dark-roblox-hacking_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-website_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_off00002e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E30 22768 bytes
SHA-256: b16e0f9d85e9d8a80b43e485c9296a423fc6b7914e9e8689e28ffea972cc37d4
font_01_sfnt_off00006131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6131 19524 bytes
SHA-256: 14a086dc1e5e4ff10b67577f0e5d46f06955a65c165cd1564d323bc67bf6ea37

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