Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e21641c835ba5d…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 03:17:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 438acf9f9f2c18445077dfee2b68fb0f SHA-1: 8415c7e33d177ade3f0f02ce1b91cd57ff9def61 SHA-256: 37e21641c835ba5df6826b2681f0de18106a86f12744c382253bb0eec60b88a0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that point to known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks'. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-400-spin-link-game-hack. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites, likely for phishing or malware distribution.

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-400-spin-link-game-hack In PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-cheat-engine-infinite-health_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-items-roblox-2021-list_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/earn-free-robux-com_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-script-executor-free-mac_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/oprewards-hack-robux_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/zephplayz-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/cops-and-robbers-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-cheats-get-free-money_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-roblox-gear_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/q-clash-roblox-release-date-for-free_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/best-app-for-free-robux_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-hack-people-for-revenge-on-roblox_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/download-coin-master-free-spins-link-2021-today_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_off0000322d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x322D 23404 bytes
SHA-256: 311cc1a62fd31846fca8e12fca60cef260090f409dd2a785f7dafb7d3a76aa41
font_01_sfnt_off00006725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6725 18576 bytes
SHA-256: 03cfcee3629fde15fc54ef21dd04dbc20dfbd27d31ac9ca7d4de5a8c615e5409

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