Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94996932bb6f828…

MALICIOUS

PDF

39.1 KB Created: 2021-05-22 02:12:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0bd7d72f9f880b8f1ba1593f3a4feb20 SHA-1: 591282d0445069e8aabba4bd989365e851324554 SHA-256: c94996932bb6f82839d1da868f7ef155293b531c28d64a53763454ce2a99cca2
82 Risk Score

Malware Insights

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

The document body and extracted URLs indicate a lure for free game currency, likely Robux, by presenting a fake CAPTCHA to trick the user into clicking a malicious link. The ML classifier also flagged this PDF as malicious. The primary malicious URL identified is https://netcdn.xyz/app/431946152/how-to-get-free-robux-easy-game-hack, which is likely to host a second-stage payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/how-to-get-free-robux-easy-game-hack
    • http://stroyproekzia.ru/images/instagram-free-coin-master-spins_GM406889139.pdf
    • http://stroyproekzia.ru/images/how-to-hack-roblox-games_GM431946152.pdf
    • http://stroyproekzia.ru/images/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdf
    • http://stroyproekzia.ru/images/coin-master-cards_GM406889139.pdf
    • http://stroyproekzia.ru/images/free-robux-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003336.bin
c6a0592d68aa6ff80841c6590c18de8b2ee05d488abd59ec18e01ae0bf53489c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3336 25032 bytes
font_01_sfnt_off00006c41.bin
baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C41 2844 bytes
font_02_sfnt_off00007602.bin
afa93f6b5b78c11c56913a3e0021d293f85f1b4278f41e2b8713ad9a89f051de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7602 18688 bytes

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