Malicious PDF — malware analysis report

Static analysis result for SHA-256 13667c27c64eb2da…

MALICIOUS

PDF

34.5 KB Created: 2021-07-10 00:55:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2fd8e78e676eb55702ca4f146da39d66 SHA-1: db8be50dd35abac9e74974e5aaa66e9e68f5ad9d SHA-256: 13667c27c64eb2dace5d7b10cc45f2a5df5c7eed561804fa47cb27502788025e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a call-to-action phrase designed to lure users into clicking on a URL that leads to a malicious redirector. The primary URL, http://netcdn.tw/app/406889139/coin-master-hack-apk-facebook-login-game-hack, is associated with known malicious infrastructure and is presented as a 'free generator' for a popular game. The document's content and heuristics strongly indicate a phishing or scam attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hack-apk-facebook-login-game-hack In PDF document text
    • https://www.metal.hr/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-rixty-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/free-roblox-tshirts-download_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/minecraft-font-free_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-giftcards-de-roblox_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/robux-earning-sites_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/tiktok-free-50-followers_GM835599320.pdfIn PDF document text
    • https://www.metal.hr/files/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/hack-roblox-200-primeros-roblox_GM431946152.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
stream_002_off00002fe6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FE6 23072 bytes
SHA-256: 3c4198fa5e634e918974c8f3e52738e0d0770bf1e71f68c7a309bc11ad91a77b
font_01_sfnt_off0000639c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639C 18504 bytes
SHA-256: f93699cca819ed26e1c568ad4486e6c3795ff68a76fc7fb57fa9b200e60d6c9e