Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c6c936666d01cd…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 09:41:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 88d3453e6c6fe42db1e973253538c1a8 SHA-1: 7239a87b0aba3aecba295cdc9b5de4de29fc62b2 SHA-256: d3c6c936666d01cd7bd114a65a81796ad4603a7b9f962ca93b526f8770e8e245
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure, directing users to click a link that likely leads to the download of a second-stage payload. The embedded URL, https://netcdn.online/app/431946152/free-group-roblox-game-hack, is associated with game hack lures, suggesting a social engineering tactic to entice users. While no scripts were directly extracted, the PDF structure and heuristics indicate a malicious intent to exploit user interaction for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.online/app/431946152/free-group-roblox-game-hack PDF link annotation
    • http://zagorjeadventureteam.hr/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://zagorjeadventureteam.hr/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://zagorjeadventureteam.hr/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://zagorjeadventureteam.hr/files/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://zagorjeadventureteam.hr/files/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/robux-boost_GM431946152.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://zagorjeadventureteam.hr/files/coinmaster-com_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://zagorjeadventureteam.hr/files/roblox-free-pants_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_off000050df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50DF 24528 bytes
SHA-256: c6b00e766c9d1fd1a83bbef7197b69c59fa094db27a9e6c8b1b64e5b7cbe1e81
font_01_sfnt_off00008974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8974 18264 bytes
SHA-256: 31cc93a5829e223d58b1b30bfb51d13dea7d7899258fccbb6445770557a8d4bf

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