Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef39d30c07c58383…

MALICIOUS

PDF

39.3 KB Created: 2021-05-24 02:58:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dff26036a610489a0352e0c36f403664 SHA-1: 19c78b7cb1f8899483591457b7c86cffd4c6ee39 SHA-256: ef39d30c07c58383a15b90f2cfa530d002f62b57475b1ada1d068e55b3dea78e
160 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to malicious infrastructure, specifically a 'game hack generator' lure. The ML classifier also flagged the document as malicious. The presence of embedded links and the nature of the lure suggest an attempt to trick the user into downloading or executing a secondary payload, likely through a drive-by download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8068

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/coin-master-spin-free-game-hack In PDF document text
    • https://gimnaziya6.kz/images/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • https://gimnaziya6.kz/images/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://gimnaziya6.kz/images/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://gimnaziya6.kz/images/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • https://gimnaziya6.kz/images/free-robux-websites-2021_GM431946152.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003420.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3420 25464 bytes
SHA-256: 27e51731a9c33019737600b714f3e12dfa377398ea80267eb90722fe62bfcb75
font_01_sfnt_off00006d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D77 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off0000795f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x795F 17884 bytes
SHA-256: f64f8d8cd546afe107dcd88d9ce91258665e3d619825ef5ba403a2abc0c27184

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