Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7f346671d74729…

MALICIOUS

PDF

48.3 KB Created: 2021-04-26 21:31:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 977af24324a8ad73752cec8d13b3d699 SHA-1: 4dcacb96eeed6d8bfeda0634549a9b889d42a7bc SHA-256: 8b7f346671d747293d1caeb3c5bbc49d04ecb6b0c9df72889cc94ab24df5ac37
82 Risk Score

Malware Insights

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

The PDF document contains a lure for free Robux and a call-to-action button, indicating a social engineering attempt to trick the user into downloading a malicious file. It also embeds multiple URLs, one of which is a direct link to a potential payload. The ML classifier strongly flagged this PDF as malicious, supporting the observed attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 4

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/www-roblox-com-robux-free-download-no-surveys-game-hack PDF link annotation
    • http://www.drent.se/images/alot-free-robux.pdfIn PDF document text
    • http://www.drent.se/images/how-to-make-a-roblox-hack-gui-visual-studio.pdfIn PDF document text
    • http://www.drent.se/images/roblox-hack-download-pc-2021.pdfIn PDF document text
    • http://www.drent.se/images/fairy-world-roblox-hack-pastebin.pdfIn PDF document text
    • http://www.drent.se/images/how-to-get-free-robux-really-works-2021.pdfIn PDF document text
    • http://www.drent.se/images/tampermonkey-roblox-hack.pdfIn PDF document text
    • http://www.drent.se/images/roblox-high-school-how-to-fly-for-free.pdfIn PDF document text
    • http://www.drent.se/images/roblox-hack-week-custom-materials.pdfIn PDF document text
    • http://www.drent.se/images/be-skeptical-of-roblox-free-robux.pdfIn PDF document text
    • http://www.drent.se/images/hack-compte-roblox.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_003_off00004359.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4359 39212 bytes
SHA-256: 1040327f12e672aea6c90d5a4388cfd3f3af122f1052dcfc69c9feb2fdcf3297
font_01_sfnt_off000097d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97D0 19576 bytes
SHA-256: c77bc09b286666646089ae7120e1f0bfc8078a6e5558c0e74a06fc463a34c00e

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