Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e6544579b08b37…

MALICIOUS

PDF

37.2 KB Created: 2021-05-22 15:10:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 399ee6747e2d1806908dd9894c257a12 SHA-1: e46af61284b1ebc2c1e579250f926a474c727042 SHA-256: b7e6544579b08b3722005d6603cd4b6fdbd7877c607d20b2595eee1f4ffc3afa
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a "Click here to download" lure, aiming to trick users into executing malicious content. The embedded URL points to a likely scam page related to free Robux, and other URLs suggest further malicious documents. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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-robux-scams-game-hack
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/minecraft-com-free_GM479516143.pdf
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/pubg-uc-icon_GM1330123889.pdf
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/unlimited-robux-2021_GM431946152.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/views-for-tiktok-free_GM835599320.pdf
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/pubg-700-uc_GM1330123889.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033e5.bin
387cd5cccd9cdb03d2d01a43f1a81221cb3c62a409c187f695857317e3f1d0b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33E5 25444 bytes
font_01_sfnt_off00006f93.bin
f6eebadb3de4af7ab0205057cc55fc1daf9397692da1370c2a19d2d749ad11f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F93 18500 bytes

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