Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aac7db656bd3cba…

MALICIOUS

PDF

37.6 KB Created: 2021-05-13 08:31:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 31847f9a30145ef97bf71d5efd5083a7 SHA-1: 52623891e41a9d8c63890658623c7f56c7ffca1c SHA-256: 2aac7db656bd3cba40c55fb740ba8350662e361563bf9f800af580a1bde58365
92 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA and advance-fee scam lure, presenting itself as a "Robux Generator" to trick users into clicking a malicious link. The embedded URL points to a domain known for hosting malicious applications, suggesting the document's primary purpose is to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/how-to-get-free-robux-app-game-hack
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000320f.bin
dd4e1b391d9276d4066ee2b280f2951016ff33c24a7124c6736e815a5b25a640		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x320F 27204 bytes
font_01_sfnt_off00007109.bin
9b29575604d2c2a5900261a35c88052e604744084870fcd9fc708b4f32deccf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7109 18460 bytes

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