Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efd6e6eb558171a…

MALICIOUS

PDF

43.2 KB Created: 2021-05-19 19:40:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b3c891ad52067b7788bebae5d466400c SHA-1: e5a88e22548500663afe64a1944caf6101acf01a SHA-256: 1efd6e6eb558171ad955c881b00287fd6c72585073a6e266d13dceacfce7a5a8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as 'free generators' or 'game hacks'. The primary lure URL is https://netcdn.xyz/app/406889139/free-spins-for-coin-master-2021-game-hack, which is associated with a high-risk score. The document body and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely for further malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-2021-game-hack In PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/infinite-robux_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/114-hacks_GM479516143.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • https://www.unicor.co.th/assets/editoruploads/files/coin-master-hacks-for-android_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c39.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C39 25196 bytes
SHA-256: 9669fad5450705eb750ed647ee5b962d920b79262986f937a5cba52033bd659c
font_01_sfnt_off00008680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8680 18288 bytes
SHA-256: 66febbde5b4b2b6a44609229e8681f3f0581fff3ed5f82ed8e3d83342858c217

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