Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42c50ec9173a9e9…

MALICIOUS

PDF

37.4 KB Created: 2021-05-22 14:52:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4091e3fa24cb57b1f05fd43cfeffb6d7 SHA-1: eb8775f7a01542441d1bb8ef728c89c1ede44797 SHA-256: d42c50ec9173a9e9808948f14f1ff5da3e35381c88a5a54d23408872a08f32b2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA and a call-to-action button, luring users to click on embedded URLs. These URLs, such as 'https://netcdn.xyz/app/431946152/how-to-free-robux-game-hack', likely lead to a malicious site designed to exploit users. The document's content and heuristics strongly suggest a social engineering attack aimed at tricking users into downloading or executing further malicious content.

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/how-to-free-robux-game-hack
    • http://rainbowbuddha.academy/images/coin-master-free-spins-link-facebook-page_GM406889139.pdf
    • http://rainbowbuddha.academy/images/coin-master-gold-cards-free_GM406889139.pdf
    • http://rainbowbuddha.academy/images/free-robux-giveaway-live_GM431946152.pdf
    • http://rainbowbuddha.academy/images/instagram-coin-master-free-spins_GM406889139.pdf
    • http://rainbowbuddha.academy/images/free-robux-accounts_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003166.bin
fa2ded9b1bebd63e3527f03bb56688386a8b313f0e3002e8c8fb6d97008a04f7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3166 27896 bytes
font_01_sfnt_off0000710d.bin
b892188b0545c7b74f3e706ff7289536b8608c6e24b963a14dda60cd6c46c02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710D 18180 bytes

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