Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb1d5b2d272aa90…

MALICIOUS

PDF

33.5 KB Created: 2021-07-19 23:52:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b0a7d25f14c767d4f65fe425c771793b SHA-1: 6f737b9c06dd470dcf63a6f96f562c38409d3330 SHA-256: dbb1d5b2d272aa90c4a6b7a85c68603a5d3d802b362161e76d0455dc891eb831
82 Risk Score

Malware Insights

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

The document employs a fake CAPTCHA lure to entice users into clicking embedded links, which are likely intended to download further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple suspicious URLs reinforces this assessment. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://netcdn.tw/app/479516143/free-minecraft-mods-game-hack
    • http://scuttworksdesigns.us/images/free-spins-on-coin-master_GM406889139.pdf
    • http://scuttworksdesigns.us/images/roblox36com-free-robux_GM431946152.pdf
    • http://scuttworksdesigns.us/images/free-robux-easy_GM431946152.pdf
    • http://scuttworksdesigns.us/images/minecraft-windows-10-free-code_GM479516143.pdf
    • http://scuttworksdesigns.us/images/robux-free-online_GM431946152.pdf
    • http://scuttworksdesigns.us/images/free-coins-on-coin-master_GM406889139.pdf
    • http://scuttworksdesigns.us/images/how-to-start-a-minecraft-server-for-free_GM479516143.pdf
    • http://scuttworksdesigns.us/images/coin-master-free-daily-spins_GM406889139.pdf
    • http://scuttworksdesigns.us/images/minecraft-java-edition-free-trial_GM479516143.pdf
    • http://scuttworksdesigns.us/images/free-coins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030be.bin
19d2f22989984b17fa228720e2428947bfad89bbe006d24c1380dd6541d0b971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30BE 22388 bytes
font_01_sfnt_off00006247.bin
adaa6c4c94b3243dd254ffbddf76305537cf905bb6459c29a6343236798c761b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6247 17884 bytes

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