Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c81738e262ef6e…

MALICIOUS

PDF

37.1 KB Created: 2021-05-24 12:08:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 600ad36aea39591bc032566ac052da9e SHA-1: 6bb3a002bf1f33c065fd606653b980091ca712f7 SHA-256: 89c81738e262ef6ec5db72f26fcd4deb3bada23a6930b5b8adc971b28fc7abc8
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, directing users to click on embedded URLs. The primary URL, https://netcdn.xyz/app/431946152/ways-to-get-free-robux-game-hack, is likely a landing page for a malicious download or exploit. The ML classifier also flagged this PDF as malicious with high confidence.

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/ways-to-get-free-robux-game-hack
    • http://www.drent.se/images/free-coins-for-coin-master_GM406889139.pdf
    • http://www.drent.se/images/how-to-get-free-robux-no-verification_GM431946152.pdf
    • http://www.drent.se/images/roblox-robux-hack-generator_GM431946152.pdf
    • http://www.drent.se/images/free-spins-coin-master-no-survey_GM406889139.pdf
    • http://www.drent.se/images/free-robux-offers_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032ee.bin
97aa7176749f572dffc569c7f96bcd8cd6e3044bcaad7bac5dbb70a8a25ce7f5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32EE 25528 bytes
font_01_sfnt_off00006e43.bin
b2cd5ec598a8c260812e966e9710fb38f03066217a6d0ec8f431d8a9dca8af42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E43 18724 bytes

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