Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99c48b4492f7cf6…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 21:52:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b2b3923b501fa1fe3ef36d2b62fdf0f0 SHA-1: 65e4f1c47283b9f948d97eb475ad7a7c7236d462 SHA-256: c99c48b4492f7cf61f90e7a779f03aaa0b028cc78306f4ef9fe1afa5801255f1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a document body that explicitly advertises cheats and hacks for popular games like Coin Master and Roblox. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to external sites suggests an attempt to redirect users to download further malicious content or engage in phishing. No scripts were extracted, but the overall pattern indicates a social engineering lure for potentially unwanted or malicious downloads.

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-daily-gifts-game-hack In PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/how-to-get-free-stuff-on-roblox-catalog-2021_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/play-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/how-to-hack-peoples-password-on-roblox_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/free-robux-page-demo_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/easyrobux-today-free-robux_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/free-robux-obby-easy_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/como-distruir-juegos-en-roblox-sin-hack_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/best-script-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/1-https-wwwrobloxcom-games-202120211-mortusrpgfreevip_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/robux-free-com_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
font_00_sfnt_off0000330a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x330A 22552 bytes
SHA-256: 1009e929bb75948da54bfe07d0b2a2392e2ebed02943cd14d5db3239329e862f
font_01_sfnt_off0000655a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655A 18256 bytes
SHA-256: 9a57ad812e157e436bcc4047eb8b4adcab852283a97400467038476e1586e01e

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