Malicious PDF — malware analysis report

Static analysis result for SHA-256 92dd72458b204b23…

MALICIOUS

PDF

35.8 KB Created: 2021-05-21 15:13:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5538ac8fdfbfb8ddfce8655ccd708d68 SHA-1: a065ce5a920800596a376c6041862fea44f85c9c SHA-256: 92dd72458b204b23685ed53b66d7ea3b63aa3c724c8dd96c207e03eee24e1e17
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 and embedded links to external websites, suggesting an attempt to trick the user into downloading further malicious content. The ML classifier also flagged this PDF as malicious. The embedded URLs point to sites offering 'free Roblox hacks' or 'robux', common lures for social engineering attacks.

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/431946152/free-roblox-game-hack
    • http://pwpyemen.org/images/free-robux-by-watching-ads_GM431946152.pdf
    • http://pwpyemen.org/images/robux-robux_GM431946152.pdf
    • http://pwpyemen.org/images/roblox-password-hacker_GM431946152.pdf
    • http://pwpyemen.org/images/free-robux-games-that-actually-work_GM431946152.pdf
    • http://pwpyemen.org/images/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030eb.bin
fea7e845f0980dee1cea8cd3406bb2eef19eefacf8cc8ee53f99cb233d2c646a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30EB 25220 bytes
font_01_sfnt_off00006b9d.bin
abd46f863f925739c6779ba87e0350ce04166d926cbd983fd5dc50e2b294e41e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9D 17948 bytes

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