Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd13479d641079bb…

MALICIOUS

PDF

35.8 KB Created: 2021-05-20 14:15:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c3c9bb88341fca7257bd36ef86de9371 SHA-1: 56e61e8fb5ddd64f06d3e67d567ef729745a65cd SHA-256: cd13479d641079bb911d5ffe3eaf83641d9fc693e1acfbd659c77da4aba65249
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or verification prompt to trick the user into clicking a malicious link. This link, 'https://netcdn.xyz/app/406889139/google-coin-master-free-spins-game-hack', likely leads to the download of a second-stage payload. Several other suspicious URLs were also found embedded within the document.

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/406889139/google-coin-master-free-spins-game-hack PDF link annotation
    • https://shimony.net/images/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://shimony.net/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • https://shimony.net/images/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://shimony.net/images/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000311f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x311F 25056 bytes
SHA-256: 24b5836315f250f293c0134d1e19b7922e0c702d6b57a54df8139996354d0a18
font_01_sfnt_off00006ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE6 18248 bytes
SHA-256: d32188c22f9df4e49535359cc17236f14c93b7b5c7ebedc8928f30f104243849

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