Malicious PDF — malware analysis report

Static analysis result for SHA-256 884eef7837796bdd…

MALICIOUS

PDF

35.7 KB Created: 2021-06-29 16:08:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3e32be49239a600cac4415498341ef32 SHA-1: ea0cc4cfe82b0e1ab4d80c57b46c5fb702c21f9a SHA-256: 884eef7837796bdd6e45ecfd74c987a019daea48424aea86d8835094842ee7ec
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are presented as 'hacks' or 'cheats' for popular games and applications. The ML classifier strongly indicates maliciousness, and the presence of numerous SEO-optimized PDF links suggests a link farm designed to distribute malware or lead users to phishing sites. The document body, though partially corrupted, contains references to 'Roblox Hack' and URLs pointing to game-related cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.co/app/431946152/roblox-hack-shirt-id-game-hack PDF link annotation
    • http://ycstamping.com.tw/image/data/files/roblox-piano-monody-hack-delay_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-roblox-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-dayz-cheats_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/download-roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/create-app-like-tiktok-free_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/apps-that-get-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/https-roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-get-robux-free-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-change-roblox-name-for-free_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_off000033f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33F0 22488 bytes
SHA-256: 25b5fb063c0d022e43acb786f598430e9f291171e32aede20078b1acc4715d95
font_01_sfnt_off00006606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6606 19220 bytes
SHA-256: 1b98c919e2d0bae25827e05388aa176898a57b49e9e6b6fec6e70d0914226692

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