Malicious PDF — malware analysis report

Static analysis result for SHA-256 871718168c4c4b67…

MALICIOUS

PDF

36.9 KB Created: 2021-05-21 16:12:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f891d20edd85e78a1aa1c447bdf954ad SHA-1: 53bdb56ead345f0e3cf7d56dece20a8d8ec6a00e SHA-256: 871718168c4c4b6742cc40e1df6cf81402fe788d0b351c09005b79d2f9e620ea
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure and a prominent 'CLICK HERE TO ACCESS ROBLOX GENERATOR' call to action, which is a common social engineering tactic. It also embeds multiple URLs pointing to potentially malicious content related to 'free Robux', suggesting a phishing or malware distribution attempt. The ML classifier also 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/roblox-promo-codes-for-free-robux-game-hack PDF link annotation
    • http://vibrato.fr/images/robuxhub-net_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x326A 26016 bytes
SHA-256: d416594cd4cbd83cacd253e422fb917d456afc3e43ab3e4ae6c8fc94da74dfb2
font_01_sfnt_off00006de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE9 18676 bytes
SHA-256: 3ed324e585500d41944ebd93500991c566830021fec9c5a8323b790459c3443f

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