Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91363cecb21592e…

MALICIOUS

PDF

36.6 KB Created: 2021-05-22 09:23:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a2ec1e2b0f2a6d49fb1e89e81e614662 SHA-1: 598f0c2a96a4165a90afa15451be28792f6ea479 SHA-256: a91363cecb21592ef48500c939d31916b2fcb58265794253b30d85c1e064bc5e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The embedded URL, 'https://netcdn.xyz/app/406889139/free-spins-for-coin-master-app-game-hack', is identified as malicious infrastructure. While no scripts were explicitly extracted, the nature of the lure and the malicious URL suggest an attempt to redirect the user to a site that likely hosts further malicious content or phishing attempts, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.0076

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/406889139/free-spins-for-coin-master-app-game-hack In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002c42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C42 25176 bytes
SHA-256: 01d5749e6a8dd01f15938fdf264ae001c3e6d582ff593270e42a575202f494b6
font_01_sfnt_off0000652b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652B 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00006edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDC 17884 bytes
SHA-256: c0e07e045f0496ba68af439e810d5bb13e23b0d850ef9426c095223eaa712aa7

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