Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c206d6cba495125…

MALICIOUS

PDF

34.2 KB Created: 2021-06-26 04:21:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: be4a811c28d662b2270ca517be6271b7 SHA-1: 1dc33a2d2df8ccedd0aa9165db6a2097282abc0f SHA-256: 6c206d6cba4951250bf5db90c1deabdf82a78bb8de064edceaebfbf8f4797198
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and references to 'free Robux' and game hacks, which are common lures for phishing and malware distribution. The primary link, http://netcdn.co/app/431946152/free-robux-game-nocopyslocked-game-hack, is identified as a malicious redirector. This suggests the document's purpose is to trick users into visiting this URL, likely leading to further malicious content or 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.co/app/431946152/free-robux-game-nocopyslocked-game-hack In PDF document text
    • https://www.croydex.com/uploads/files/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/www-roblox-com-games-for-free_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/tiktok-2021-free-download_GM835599320.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/fb-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/hack-robux-ios-2021_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/impact-hacked-client-roblox_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/get-me-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/show-me-how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/robux-hack-2021_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_off00002f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5C 21500 bytes
SHA-256: f5eeb6351cbb987aac4eb9d8501676c4f7533e7f8ba31527cd2c5812e07b8d87
font_01_sfnt_off00005eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB1 19752 bytes
SHA-256: 758c7acd4c738aacaf7410fa17ffd7f182f2217f7efdd57258097df7fde1c363

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