Malicious PDF — malware analysis report

Static analysis result for SHA-256 3058cac2ef2773b7…

MALICIOUS

PDF

38.7 KB Created: 2021-05-17 09:35:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 94b6cba4c612957ba2cf8c5aaa7aa883 SHA-1: b7d8f1d6a4e831a6aacaafa747e91709ff4a9bc7 SHA-256: 3058cac2ef2773b7202c1f0ea6d6ba302f63aacba375a20e064194e6f5428eb5
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF contains a critical heuristic firing for a redirector link that impersonates Microsoft and promises free Robux, indicating a credential phishing or malware lure. The embedded URL, 'https://netcdn.xyz/app/431946152/actual-free-robux-game-hack', is directly associated with this malicious activity. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest potential for client-side exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/actual-free-robux-game-hack.
  • 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
  • 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/actual-free-robux-game-hack In 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_003_off000033a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33A2 29892 bytes
SHA-256: 607ede1ae14b55e4f76b28a0c5edd7fc04a45a7e6a483597346005799fd86c73
font_01_sfnt_off00007578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7578 18420 bytes
SHA-256: 37b67a04c59087902b42b65f26bec20808041b5185ddbc4d4c9e15973e68d0ef

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