Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0fb15925816ec82…

MALICIOUS

PDF

36.8 KB Created: 2021-05-24 18:02:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e5642092f4de94d73a62da71323f35bb SHA-1: 7f1b468d3f410ccc0acbaa72108683d3e23a9c98 SHA-256: f0fb15925816ec82f9a3e05e935e7cea94ac7ae2bb4acdc2087d3b9a9762dcfb
82 Risk Score

Malware Insights

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

The document presents itself as a "Roblox Land Free Robux" generator and contains a fake CAPTCHA lure to trick users into clicking a malicious link. The embedded URL and other extracted URLs point to sites offering free Robux, reinforcing the social engineering aspect. 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/roblox-land-free-robux-game-hack
    • https://dr-willmer.de/images/free-robux-no-apps_GM431946152.pdf
    • https://dr-willmer.de/images/coin-master-free-spins-16-04-19_GM406889139.pdf
    • https://dr-willmer.de/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • https://dr-willmer.de/images/how-to-get-free-robux-for-real_GM431946152.pdf
    • https://dr-willmer.de/images/rich-free-roblox-accounts_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003236.bin
8bc6af88dbccb3a00764b1cdad24e6e594dd5537d4befdc2607a7c045ae59046		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3236 26636 bytes
font_01_sfnt_off00006e0a.bin
dd1922fe1cc281356c7e312f91778e191ebdc244bf13f8823862483f595251c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0A 18492 bytes

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