Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec76ff8b6046437f…

MALICIOUS

PDF

35.1 KB Created: 2021-05-23 23:10:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bb6d7c7e721c48f6103b28d2207cbb9b SHA-1: fc802d43a85f55228e1071d05a8236cd2d1fc32f SHA-256: ec76ff8b6046437f4cfd5bee6bcd33746d8c5ead8103ca310df15791e140255d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically advertising a 'free Robux generator'. The document body and metadata also indicate the use of wkhtmltopdf, which can be used to generate malicious PDFs. The primary lure is a fake game hack generator, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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-legit-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_off00002ca0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CA0 25184 bytes
SHA-256: 0c0be71b8ae97555ec4b710678c24864e7be4e78881c327dba55b550aaf10bfe
font_01_sfnt_off00006742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6742 18528 bytes
SHA-256: aa02e962ea97e6ca8489eff7fd27dc9c81bb0b76c5ed523337a23ffa677521ed

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