Malicious PDF — malware analysis report

Static analysis result for SHA-256 efde0d3e0b470e01…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 00:52:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cfac976d669fda8446214fccce9ee06a SHA-1: 70c499317a52e5424c1734224df19fa3a35e3883 SHA-256: efde0d3e0b470e01028d0fa6c5cc84409db816de16f29991a42b5ea758f4f214
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free in-game currency and hacks to entice users. It contains multiple links to redirector domains, including http://netcdn.tw/app/406889139/coin-master-free-spins-and-coins-game-hack, which is flagged as malicious. The document's structure and embedded URLs suggest it is designed to lead users to potentially malicious websites that may host further exploits or download unwanted software.

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-free-spins-and-coins-game-hack In PDF document text
    • http://global-brand.net/userfiles/files/how-to-hack-roblox-games-no-downloads_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-not-clickbait_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/moonactive-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/roblox-troll-shirt-free_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/blogspot-coin-master-free-spins_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
stream_002_off00002f14.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F14 22684 bytes
SHA-256: 4448d82d2a34bc59e301bd169ed2d3f622eb40f31cacc7b48cf42ef4ea0716b3
font_01_sfnt_off000061e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E2 18348 bytes
SHA-256: 3aa320ccb9cb7c087074e4ef079b33192d8e05703f275142029ef104db56ac85

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