Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef43bcd8e453f875…

MALICIOUS

PDF

42.7 KB Created: 2021-05-18 00:45:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b4c2971b3b23edf7dd6f6fb3ab2e6049 SHA-1: 7bb464cb66835cff66b7e0a052566da879bed51d SHA-256: ef43bcd8e453f875a2c60e65c0171816c70e4fc283b6508e350e1098b4892fd9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, masquerading as game hacks and generators. The primary lure, 'Coin Master Spin And Coins Free', directs users to `https://netcdn.xyz/app/406889139/coin-master-spin-and-coins-free-game-hack`. The document body and embedded URLs suggest a phishing attempt to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-and-coins-free-game-hack In PDF document text
    • http://deyuan-pc.com.tw/images/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/free-spins_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/get-free-coin-master_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://deyuan-pc.com.tw/images/free-rewards-coin-master_GM406889139.pdfIn 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
font_00_sfnt_off00004ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AB2 26000 bytes
SHA-256: 317cebf7972b166ad747825b1415041526b4e300078bf58d2890d2b76c598e4b
font_01_sfnt_off00008533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8533 18060 bytes
SHA-256: aba7dcfd42a0f74c9e892866c2c78c20b6cae4d7af540321f27c32cc6aee9396

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