Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf7057869d2c85c…

MALICIOUS

PDF

36.4 KB Created: 2021-05-17 16:51:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 18bd16360f9d9b232772f6a196da7596 SHA-1: 2cbd2ac59d7cd423166c0a582a5331a4dc6f2e8e SHA-256: eaf7057869d2c85cdfde5990e1f794903a1b777773e0741cee5e56900c0ded5c
92 Risk Score

Malware Insights

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

The PDF document contains a lure for "free spins" and a "game hack" which is a common social engineering tactic. It displays a fake CAPTCHA or human verification prompt to encourage users to interact with a malicious link. This link, https://netcdn.xyz/app/406889139/get-free-spins-coin-master-link-game-hack, likely leads to a site designed to exploit the user or deliver further malware.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/get-free-spins-coin-master-link-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000033ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33AD 25168 bytes
SHA-256: ef89baedc31e3f2777d163c20c862b7617257455124b5faa819c96daac09e14b
font_01_sfnt_off00006dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBF 18056 bytes
SHA-256: ab85056fbf29cd03dcfab7de7beb0343ed26656e2e8858e8ad52cb7aa31a5a92

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