Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31fcc320cfa5962…

MALICIOUS

PDF

41.6 KB Created: 2021-05-24 11:30:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f2913fd3cb8d719b4ff7a390562083d9 SHA-1: bbc848b9bab4b588dc083456c5f5516ef5908f9d SHA-256: c31fcc320cfa5962a4ed54b1c6c1b56c2f8826b98d58fe5f4a4d9f3e16972a9b
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, aiming to trick users into interacting with malicious content. It embeds multiple URLs, including one pointing to a "free robux" generator, suggesting a phishing or scam attempt. The presence of embedded URLs and the fake CAPTCHA heuristic strongly indicate an attempt to redirect users to malicious sites for potential credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7527

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-discord-game-hack
    • http://www.pspmrsmbpj.com/opac/repository/how-to-use-redstone_GM479516143.pdf
    • http://pspmrsmbpj.com/opac/repository/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://www.pspmrsmbpj.com/opac/repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdf
    • http://www.pspmrsmbpj.com/opac/repository/free-robux-clothes_GM431946152.pdf
    • http://www.pspmrsmbpj.com/opac/repository/how-to-hack-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033d9.bin
4457d61256c4eab55ade56b5e28d3d305c7a04295ca2061d8e2dcf86a4ddb4a9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33D9 29220 bytes
font_01_sfnt_off0000761f.bin
471f662098e83c5562504503f5e7603b336ca0957605358090bb98e15c7aed80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761F 3112 bytes
font_02_sfnt_off000080d9.bin
bd0365f7f2eefd731cbfcd90ede0e91cb43578b4b980f4195e4871e1034addc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D9 18476 bytes

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