Malicious PDF — malware analysis report

Static analysis result for SHA-256 636655ee3146a19b…

MALICIOUS

PDF

45.0 KB Created: 2021-05-12 06:06:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5cc58c261ac39ac7db98055bf0649ce5 SHA-1: 9cb33005c9ca814c8a6a7b6668294ff0d5e649ed SHA-256: 636655ee3146a19b50b4b1eadb51ec451d0ebdfeff1da400c69a115259ac841b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, masquerading as game cheats and free currency generators. These links, such as 'https://netcdn.xyz/app/406889139/cheats-coin-master-free-spins-and-news-game-hack', are designed to lead users to potentially malicious websites. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/cheats-coin-master-free-spins-and-news-game-hack In PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-come_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/fbchampion_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/robux-boost_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E4 25024 bytes
SHA-256: 52ec0ea1b5f28ed5541d9f75b4f3ea1d80ab589d52242b2023616fa15affeadc
font_01_sfnt_off0000834b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x834B 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFC 18392 bytes
SHA-256: 6e3532b57e357ea54aa540dad09cc71b9a89d5bb5520344c7ec5021d108e9267

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