Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e44173e76eabd9c…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 14:02:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e1f691f27f6e201e48d2fa31fecc6607 SHA-1: 709a4ba0ddff85765913707e105bfa234b17a680 SHA-256: 4e44173e76eabd9cd05b35ebc9afda8d242713c06d251117569bf8cfdb8b35c5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'Coin Master Hack' and 'Robux' generators. These links likely serve as a lure to download further malware or lead users to phishing sites. The ML classifier also strongly indicated maliciousness.

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-cydia-game-hack In PDF document text
    • https://yeushuen.com.tw/image/data/files/earn-robux-online_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/robux-hacker-co_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-roblox-groups_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-top_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-hacks-for-hilton-hotels_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/redline-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/cool-free-outfits-roblox_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-follower-hack-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-snow-shovelling-simulator-hack_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spin-2912-2021_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_off00002e7d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E7D 22728 bytes
SHA-256: cb8c8c16f9a0bdc8c11b3c72e40def9064b2bffaf45daec74f29da98a1229007
font_01_sfnt_off0000615f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x615F 18356 bytes
SHA-256: c1ae93ae19acdde747f9b30a7c27420f2058cd5987fc5615fdc11fefbec34302

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