Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c3f2b89519fb43…

MALICIOUS

PDF

41.7 KB Created: 2021-05-20 20:42:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 57adb334b8cbf459c53b44a696db61b9 SHA-1: 6c219f83e39b618d376d588a7dda559673f05b80 SHA-256: b4c3f2b89519fb4398163f766b54e70e80031b47605e9f4baec6ff3b2ac0e673
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for 'Free Robux Hack' and a prominent call-to-action button, directing users to a malicious URL. This URL is identified as part of a redirector infrastructure, indicating a phishing or scam attempt. The document body and heuristics confirm the malicious redirector link and the lure used to entice clicks.

Machine Learning

  • Nyx PDF Classifier clean score 0.0137

Heuristics 4

  • 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.
  • 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/free-robux-hack-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002e10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E10 30776 bytes
SHA-256: 83bdffd59cd496d549ecee6a5dfa21071e2ac2fcb82bb8ab81824ae375821dab
font_01_sfnt_off000074e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74E7 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000818e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x818E 18412 bytes
SHA-256: 8090616d8a5c0701bec53dfbbcc7430816d9db69864bd7c9067c717eb12c26b4

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