Malicious PDF — malware analysis report

Static analysis result for SHA-256 428e111e5d578683…

MALICIOUS

PDF

33.9 KB Created: 2021-05-22 01:43:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d509729fcd6712745e38c62a3d0e3935 SHA-1: c3ec1365c3afc343cd26291a8d5a01f2a7d3a2a1 SHA-256: 428e111e5d5786837f8e5f681d4a9d7f36b364fecdde191017d055d6d10d8287
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that are flagged as malicious redirectors, specifically targeting users with lures related to free game currency and hacks. The document body and heuristic firings confirm the intent to redirect users to potentially harmful sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9715

Heuristics 3

  • 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.
  • 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-you-get-free-robux-game-hack In PDF document text
    • http://colsaf.co/images/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://colsaf.co/images/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://colsaf.co/images/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003335.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3335 25888 bytes
SHA-256: 20efbf93393c03f39d0625d45db6ef6e8a336989b2c60f2b4643a7ff944239dc

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