Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f3ce9b18a3ea29…

MALICIOUS

PDF

35.4 KB Created: 2021-05-24 18:30:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3212e9a6547d2a6828d6e18c525312f8 SHA-1: 7d8be6798effe0353c02fb78413df9fc04297dce SHA-256: 38f3ce9b18a3ea29f9fdc530533a527bd0bf649cee9ce93f5134f897ee8bdc85
82 Risk Score

Malware Insights

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

The document presents itself as a 'Free Robux App' and contains a fake CAPTCHA or human verification prompt to trick the user into clicking a malicious link. The embedded URL leads to a suspicious domain, and multiple other similar URLs were found within the document body, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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-app-game-hack
    • http://umksn.pl/images/is-minecraft-free-on-pc_GM479516143.pdf
    • http://umksn.pl/images/minecraft-free-online_GM479516143.pdf
    • http://umksn.pl/images/daily-free-spins-coin-master_GM406889139.pdf
    • http://umksn.pl/images/free-robux-no-verification-no-survey_GM431946152.pdf
    • http://umksn.pl/images/how-to-buy-robux-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003188.bin
843dfd95431290a84ffca4b5fc47d32d751fa0dcd9d75201b10755f8e6e3d9ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3188 24240 bytes
font_01_sfnt_off00006927.bin
b6ab7ec8c8ad827553cf0587115e299062cd48018093aec7e14a56fabc9ede42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6927 18192 bytes

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