Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d824a492abd6a3…

MALICIOUS

PDF

39.2 KB Created: 2021-05-22 07:33:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 25f7f5a049a626ac71353a1f87840ac4 SHA-1: e07fdc658b9d3a203348c783e4a8cad19f968d2b SHA-256: a1d824a492abd6a3cd000c596a7011445b019fa95b94ff4ddeb4036a178c7cc6
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, aiming to trick users into clicking a link to a malicious website that promises free Robux. The embedded URL and document body text directly support this social engineering tactic. While no scripts were extracted, the presence of external URIs and the ML classifier's high confidence suggest a malicious intent to redirect the user to a potentially harmful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/how-can-i-get-free-robux-game-hack
    • http://zarinnameh.ir/images/free-100-robux_GM431946152.pdf
    • http://zarinnameh.ir/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://zarinnameh.ir/images/free-robux-websites-no-human-verification_GM431946152.pdf
    • http://zarinnameh.ir/images/claim-free-robux_GM431946152.pdf
    • http://zarinnameh.ir/images/minecraft-marketplace-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003199.bin
759ecd939f64d506d96636cb535f677065b2e6507473a1ab1d434a877d3fe5d9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3199 25596 bytes
font_01_sfnt_off00006d1d.bin
e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1D 2852 bytes
font_02_sfnt_off000076df.bin
69cba7171cc96811b03769255314e8880e2b1f1f28661a6eda79c3c7ec8a929e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DF 18512 bytes

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