Malicious PDF — malware analysis report

Static analysis result for SHA-256 b914fa7d4655cd27…

MALICIOUS

PDF

43.6 KB Created: 2021-05-14 00:32:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 19272bd7665266f95961ad709c9d191c SHA-1: 73d4a7a52df18b315e35c51660678a69fd53354b SHA-256: b914fa7d4655cd27fe0e9fcc984eeef998023a34a7600680b98556f5edddd654
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and a large number of external links, many of which point to other PDFs hosted on similar domains. This suggests a link farm or redirection scheme designed to trick users into downloading potentially malicious files or visiting scam pages related to in-game currencies and hacks. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/how-to-make-clothes-on-roblox-for-free-game-hack
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-hack-apk-link_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-roblox-adopt-me-accounts_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/roblox-devil_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-do-you-get-free-roebucks_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/what-is-coin-master-app_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/game-toolbox_GM479516143.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-fan-hack_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-daily-free-spins-blog_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-spins-for-coin-master-game_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-roblox-cards-pin-number_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/games-that-give-you-free-robux_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/easy-way-to-get-robux_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/minecraft-pvp-hacks_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004abd.bin
29f50593bf0bf6c4a267fd6f966ba45ca5b122bda9d443824bc12011e750a18a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ABD 26348 bytes
font_01_sfnt_off0000863c.bin
b61b86c25d6115ff697aefd9ab641b9f071fd28e07f949dfa38bf6f9b5f40050		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863C 18976 bytes

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