Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8560045ffd595b7…

MALICIOUS

PDF

34.8 KB Created: 2021-06-22 08:10:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 77016e90d1106410a9484635a1ab7d0b SHA-1: 5571bbc0c63349d2daaf2679547b9d36be6b49b4 SHA-256: c8560045ffd595b72bf1f5c66027cf6862015ec3374f8cc1c825b4e6e4e55a56
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are disguised as legitimate game-related resources but lead to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous SEO-optimized PDF links suggests a link farm designed to distribute malware or lead users to phishing sites. No scripts were extracted, but the document's structure and embedded URLs point towards a phishing or malware distribution attempt.

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/406889139/100-free-spins-coin-master-game-hack PDF link annotation
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/pubg-uc-980_GM1330123889.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-in-2021-pycksel_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/earn-robux-sites_GM431946152.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://www.staugustinewebster.com/admin/ckfinder/userfiles/files/coin-master-collect-today-free-spin_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_off000032a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32A3 22564 bytes
SHA-256: c54250721f28d89a5bfae5b9641d40316426c082d901f6c42f496cda042a28e9
font_01_sfnt_off0000650c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650C 18452 bytes
SHA-256: d0c04ff51ad59f6355ad4f24aeb86ad145506544650f67de66568f082738138f

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