Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef8032290728eb8…

MALICIOUS

PDF

45.7 KB Created: 2021-05-16 11:23:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 32c90d0bc36702360595dee6a7653406 SHA-1: 5afd5657843011a4a23fbc1c2d0f72976fba16f8 SHA-256: cef8032290728eb8bf46f896d8aaf13fcff67f938c252002ee6844e2a99f024c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The document presents a fake CAPTCHA lure to trick users into clicking a link, which is a common social engineering tactic. The embedded URI and numerous other URLs point to sites offering game-related cheats or rewards, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of external links and the fake CAPTCHA heuristic strongly indicate a malicious intent to lead the user to download potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 4

  • 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/free-promo-codes-roblox-game-hack
    • http://www.bzconstructionservices.com/images/minecraft-free-no-virus_GM479516143.pdf
    • http://www.bzconstructionservices.com/images/op-rewards-free-robux_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/roblox-hack-codes_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/roblox-skins-boy-free_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/60-free-spins-on-coin-master_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/coin-and-spin_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/moonactive-free-spins-coin-master_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/www-roblox-com-robux_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/how-to-get-minecraft-for-free-on-computer_GM479516143.pdf
    • http://www.bzconstructionservices.com/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/plug-toolbox-for-minecraft-free-ios_GM479516143.pdf
    • http://www.bzconstructionservices.com/images/free-robux-clothes_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/coin-master-hacks-android_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdf
    • http://www.bzconstructionservices.com/images/coin-master-70-spin-link-today_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/40-free-spins-coin-master_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/coin-master-links-for-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b82.bin
be0e8a53d12358865e9e2a4f9e6a217e927b652de1a066e7c1078a8b2827cae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B82 25408 bytes
font_01_sfnt_off000085aa.bin
77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85AA 2832 bytes
font_02_sfnt_off00008f5b.bin
ef80caca2854abdf9bf8720e52e386ee010a7b90d5614c403206ff018aea8f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5B 18536 bytes

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