Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4cc6bf585f4618…

MALICIOUS

PDF

35.5 KB Created: 2021-05-24 23:09:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: eeffb731092d7e1e7c996472c55f735a SHA-1: 7166e98f1136a22ebf61ed29a13f0836c7b583ed SHA-256: fc4cc6bf585f461803d59a100f428fbb98432e92769925e6b0bde1f751a44bee
170 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it's a lure for game hacks and uses a fake CAPTCHA to trick users into clicking links. The primary embedded URL, https://netcdn.xyz/app/431946152/how-to-hack-to-get-robux-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest an attempt to exploit vulnerabilities or trick the user into executing malicious content, likely via a chained exploit or a malicious script embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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.
  • 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
  • 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-hack-to-get-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_002_off00002b3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B3D 28316 bytes
SHA-256: 4c535819e4c4bb973b2d47baacb93eb7f015c577b1c5c1ec1dfb83338e525a31
font_01_sfnt_off00006896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6896 18516 bytes
SHA-256: e2a97b64806b22db336191728b408e5b7179700d4ee5fd3b4b30addea2706a3c

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