Malicious PDF — malware analysis report

Static analysis result for SHA-256 e419205e05688c8e…

MALICIOUS

PDF

37.4 KB Created: 2021-05-25 07:00:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e045870915e1568088fd0ca18d8de777 SHA-1: 7bcafd86f322b81a97652ed0203c46b7e158df79 SHA-256: e419205e05688c8e92c59f61a838df12b2a7c3509c853de3e1231d1274ea4d32
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a lure for "Free Robux" and explicitly instructs the user to install a browser extension or update, a common social-engineering tactic. It embeds multiple URLs, one of which, https://netcdn.xyz/app/431946152/free-robux-accounts-game-hack, is likely the download location for a malicious payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/free-robux-accounts-game-hack
    • https://and.co.id/assets/CKImages/files/how-to-get-free-roblox-premium_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/how-to-get-free-robux-2021_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/hackear-coin-master-android_GM406889139.pdf
    • https://and.co.id/assets/CKImages/files/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • https://and.co.id/assets/CKImages/files/free-spins-from-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033ac.bin
75e34b8538ecdbd903a9df6ff06655ff30bd0f0f6b129c131995416d8949c325		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33AC 27288 bytes
font_01_sfnt_off00007164.bin
ef72730342a71d63428e939ae8b3e53b657bfaebcd113dd5195284c27a8ef9c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7164 18120 bytes

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