Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21026461fc86553…

MALICIOUS

PDF

45.6 KB Created: 2021-05-16 22:45:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6e57b1f512ec92713ef4afbfa3f6bcdd SHA-1: 44c31353856d5b0f458688a4a961e4f71b23719c SHA-256: e21026461fc865539ca8d3372b9db4d44114117dc64d404df38f204c07976531
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and a primary external URI, all pointing to sites offering game hacks and cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm designed to attract users searching for such exploits. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains text related to game hacks and the primary URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/406889139/hack-coin-master-app-game-hack PDF link annotation
    • http://bolandergroup.com/images/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/minecraft-free-edition_GM479516143.pdfIn PDF document text
    • http://bolandergroup.com/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://bolandergroup.com/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bolandergroup.com/images/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bolandergroup.com/images/www-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b7e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B7E 24752 bytes
SHA-256: d7115fb20bf961e7e17f04449aa7661aa82b46a67da8e1e4e2b8b41f217d168e
font_01_sfnt_off00008452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8452 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off000090d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D8 17892 bytes
SHA-256: 9c4dada9bbcb376b19026f9d82cd29b1bcb88de2b1ea71a23b293af0df71213a

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