Malicious PDF — malware analysis report

Static analysis result for SHA-256 1492ef867844a139…

MALICIOUS

PDF

43.0 KB Created: 2021-05-14 04:14:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 638d874e3612b871b85c2254f01c2abf SHA-1: 70682b4291e46c6767eade2b7656c0a8a7e7508b SHA-256: 1492ef867844a1399521896b5158b972bf8591847721ed3932dacba4b9d583ac
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into clicking a link, which is a common social engineering tactic. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-no-human-verify-game-hack, likely leads to the download of a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the observed attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-robux-no-human-verify-game-hack
    • http://signsglasgow.co.uk/images/free-coins-for-coin-master-blogger_GM406889139.pdf
    • http://signsglasgow.co.uk/images/coin-master-reward-link-2021_GM406889139.pdf
    • http://signsglasgow.co.uk/images/how-to-get-free-skins-in-roblox_GM431946152.pdf
    • http://signsglasgow.co.uk/images/how-to-get-free-cards-in-coin-master_GM406889139.pdf
    • http://signsglasgow.co.uk/images/links-to-free-spins-on-coin-master_GM406889139.pdf
    • http://signsglasgow.co.uk/images/all-free-items-in-roblox_GM431946152.pdf
    • http://signsglasgow.co.uk/images/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://signsglasgow.co.uk/images/easy-robux-hack_GM431946152.pdf
    • http://signsglasgow.co.uk/images/coin-master-free_GM406889139.pdf
    • http://signsglasgow.co.uk/images/coin-master-hack-program_GM406889139.pdf
    • http://signsglasgow.co.uk/images/coin-master-hack-version-apk-download_GM406889139.pdf
    • http://signsglasgow.co.uk/images/free-robux-accounts-2021_GM431946152.pdf
    • http://signsglasgow.co.uk/images/coin-master-32-hack-apk_GM406889139.pdf
    • http://signsglasgow.co.uk/images/coin-master-online-hack-no-human-verification_GM406889139.pdf
    • http://signsglasgow.co.uk/images/coin-master-free-spin-sites_GM406889139.pdf
    • http://signsglasgow.co.uk/images/free-spins-from-coin-master_GM406889139.pdf
    • http://signsglasgow.co.uk/images/coin-master-fan-hack_GM406889139.pdf
    • http://signsglasgow.co.uk/images/roblox-land-free-robux_GM431946152.pdf
    • http://signsglasgow.co.uk/images/free-spin-coin-master-game_GM406889139.pdf
    • http://signsglasgow.co.uk/images/coin-mast-hacks_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004922.bin
2a4a80a26d6681d29ac3ebba36ce0d4c049ea3f02f97604d1507c972ca272f1a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4922 25660 bytes
font_01_sfnt_off000083fb.bin
1a7af96eb5386f0345b1dbf35dc45129c86900916c4bfc8bfbf0065f0a01c751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FB 18936 bytes

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