Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafc3a047f1b39e0…

MALICIOUS

PDF

41.0 KB Created: 2021-05-12 02:49:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a5a72616d9b10bade722ccb53d940219 SHA-1: 61d261e1ca617ed017ba0ed2a491aac9c6ec6572 SHA-256: eafc3a047f1b39e01d06a9d3610f8af7f84595f7232572d652baee0d33ac16ce
92 Risk Score

Malware Insights

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

The PDF file contains a link to a website promising free Robux through a game hack, which is a common lure for phishing or malware distribution. The presence of a fake CAPTCHA heuristic further supports the intent to trick users into interacting with the malicious link. While no scripts were directly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/431946152/how-to-get-free-robux-by-playing-games-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_off000034bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34BD 30660 bytes
SHA-256: 90efb2107f21fe7c0d5202e4447b3425751c03af7f606ffa8bce43853e12dd5d
font_01_sfnt_off00007b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B63 19588 bytes
SHA-256: 4959be52701d88ef79c98b835575558ad206ad5c377459138293e90af74f97c3

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