Malicious PDF — malware analysis report

Static analysis result for SHA-256 319c9fde7993712e…

MALICIOUS

PDF

36.9 KB Created: 2021-05-22 14:42:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f94b8dc4fa1e41f6876e43bbc4c6847e SHA-1: 8b92011a8cb3b821632113836dc2c3431e870dfd SHA-256: 319c9fde7993712e813bbefc2fcf4df0de2bd3c11b6a45abdf0b209688cfa1b9
82 Risk Score

Malware Insights

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

The PDF document contains a lure for 'Free Robux' and displays a fake CAPTCHA or human verification prompt to trick users. It includes an external URI pointing to a suspicious URL, and multiple embedded URLs that likely lead to further malicious content or scams. The document's structure and content strongly suggest an attempt to deceive the user into executing further malicious actions.

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-no-human-verification-game-hack PDF link annotation
    • http://pastelli.gr/images/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://pastelli.gr/images/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://pastelli.gr/images/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://pastelli.gr/images/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://pastelli.gr/images/free-coins-and-spins-for-coin-master_GM406889139.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
stream_002_off00003285.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3285 25340 bytes
SHA-256: 0b1f62f4d931e48e0abd41266784ab3fe261fd0547b59944e2a5ad76061ad398
font_01_sfnt_off00006d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D38 18860 bytes
SHA-256: 7bf6b254896799c3550cbaf8339a45bd8c79022df116fd793fc899e49cde55bc

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