Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93ae7a0947944f1…

MALICIOUS

PDF

36.1 KB Created: 2021-05-25 08:34:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 72f8b7f42adab4c616514a7b044428ca SHA-1: 00175d4c9fde85d63d41510656009c64cde0dd75 SHA-256: f93ae7a0947944f1b6de09d60c91caec8832cdcec8e158a7fc2d4d8f07eece06
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt to trick the user into interacting with it. It contains multiple embedded URLs, with the primary one being 'https://netcdn.xyz/app/406889139/100-free-spins-coin-master-game-hack', which likely serves as a lure for a scam or malicious download. The ML classifier also flagged this PDF as malicious with high confidence.

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/406889139/100-free-spins-coin-master-game-hack
    • http://empresa-venta.hr/files/roblox-free-robux-generator_GM431946152.pdf
    • http://empresa-venta.hr/files/free-spins-coin-master-links-blogspot_GM406889139.pdf
    • http://empresa-venta.hr/files/coin-master-hack-spins-app_GM406889139.pdf
    • http://empresa-venta.hr/files/robux-hack-2021_GM431946152.pdf
    • http://empresa-venta.hr/files/coin-master-cheat-codes_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033f7.bin
2d4ed97c5c36074c491feb1b46cf4ed2c90fca4f0b67b930ce4dcb1ce1ff25b3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F7 25032 bytes
font_01_sfnt_off00006c0d.bin
9bc61af2acbda784231945e40c4a4bb5d6810b0d04641be6b37b2cdd3c5b78bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0D 18164 bytes

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