Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de581b94c0fb874…

MALICIOUS

PDF

35.0 KB Created: 2021-07-10 02:36:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fa4810d0facd90da2839e085f88debe4 SHA-1: 21725d2dd66f1061e1863bfbce3d8411f356f849 SHA-256: 3de581b94c0fb874d9105321323f15d87794b3c5bb355f022f2d4bdc2179ea90
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF links pointing to game-related hacks and cheats. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests the document is designed to redirect users to download further content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of 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.tw/app/406889139/coin-master-server-hack-game-hack PDF link annotation
    • http://hosoffices.com/ckfinder/userfiles/files/ispoofer-pokemon-go-free-key_GM1094591345.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/lumber-tycoon-2-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/how-to-hack-into-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/roblox-hack-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/mathep_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/roblox-cheat-engine-admin-script_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/roblox-get-free-pants-and-shirts-2021_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/oginject-co_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://hosoffices.com/ckfinder/userfiles/files/get-free-robux-now_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_off00003418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3418 22620 bytes
SHA-256: cf30dd4cd38b28fa736ba5157d1abab7c2c46c03d32027f3763232a678765681
font_01_sfnt_off00006690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6690 18120 bytes
SHA-256: f784733b4861a5571dacf308dff6414d50b5d345dfd948ae0acb583631775834

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