Malicious PDF — malware analysis report

Static analysis result for SHA-256 99611dff7184edd2…

MALICIOUS

PDF

36.4 KB Created: 2021-05-22 10:37:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f6384e30fb6e26815eef95b5b1293b7e SHA-1: dcf8f3e3ce9c54b135f7168ad66ccc9ae80da3a1 SHA-256: 99611dff7184edd20889e28d84ad12fa19772e0c36563cd9c9f0b68f0c7b3ba1
82 Risk Score

Malware Insights

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

The document presents itself as a 'Roblox Hack Generator' and contains a fake CAPTCHA lure, aiming to trick the user into clicking a malicious link. The embedded URL and other extracted URLs point to potentially malicious content, suggesting the document's purpose is to facilitate the download of a second-stage payload. The ML classifier also flagged this PDF as malicious.

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/roblox-hack-generator-game-hack
    • http://papec.ir/images/free-minecraft-server-hosting_GM479516143.pdf
    • http://papec.ir/images/free-robux-no-human-verification_GM431946152.pdf
    • http://papec.ir/images/free-robux-group_GM431946152.pdf
    • http://papec.ir/images/coin-master-hack-mod-apk-free-download_GM406889139.pdf
    • http://papec.ir/images/coin-master-free-spins-link-2021-twitter_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003203.bin
3aaab66d3b3503c84a47ab21dd4cbddf2a21e8646906a8f0970eabfc8f9a7c5e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3203 25396 bytes
font_01_sfnt_off00006cdf.bin
25a7dda4fa93a15709e62d61065895c31c9e65ce27a7c8bbaa34224db667a0ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDF 18284 bytes

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