Malicious PDF — malware analysis report

Static analysis result for SHA-256 b308771f11d24091…

MALICIOUS

PDF

41.9 KB Created: 2021-05-16 21:43:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7c19be6a6d9926ef2ace389c833befe4 SHA-1: a99fe16c8081947309b92775b76b27745fa7fc2b SHA-256: b308771f11d24091700e90766c7a3d71c5709500a3e2ee0a894f1c9062eb97e7
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO spamming attempt. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains a call-to-action phrase, suggesting a lure to click these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/blogger-coin-master-free-spins-game-hack PDF link annotation
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/wurst-18_GM479516143.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-robux-generator-com-roblox-hack_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
stream_003_off00004a80.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A80 23808 bytes
SHA-256: 9def20af320325a885fe930f044792193447dee1e054c2c0b3903202cc0d2327
font_01_sfnt_off000080e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E7 18464 bytes
SHA-256: 0911799b9aa5b6ecf8f75e1ae71094da345a4ed5579c86b7800e8f9c3f9f610d

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