Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cf9eb4f4b472d2…

MALICIOUS

PDF

35.0 KB Created: 2021-07-01 00:16:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: aa51ec7ef8941b262778fb3ddcce84cd SHA-1: a4fe0cf7623afa532b9d45ee8f36483d8f3e8514 SHA-256: 22cf9eb4f4b472d2da759564c83c5ff4204b4599a32f8b124e3d94a3011479ef
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains numerous links and references to 'free Robux' and game hacks, indicating a lure for users to download potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the ML classifier strongly suggest malicious intent. The primary IOC is the URL http://netcdn.co/app/431946152/free-robux-hack-on-computer-game-hack, which is likely the download source.

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/free-robux-hack-on-computer-game-hack
    • https://dolphintour.vn/images/uploadsfiles/roblox-filtering-enabled-weapon-scripts-hacks_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/free-robux-2021-no-human-verification_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/free-robux-with-no-human-verification_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/comment-cheat-sur-tower-battles-roblox_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/free-robux-reddit_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/roblox-hacked-client-download-kostenlos-deutsch_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/cmaster-club-coin-master-hack-tool_GM406889139.pdf
    • https://dolphintour.vn/images/uploadsfiles/minecraft-free-version_GM479516143.pdf
    • https://dolphintour.vn/images/uploadsfiles/free-coins-coin-master-iphone_GM406889139.pdf
    • https://dolphintour.vn/images/uploadsfiles/minecraft-free-android_GM479516143.pdf
    • https://dolphintour.vn/images/uploadsfiles/energize-roblox-hack-virus_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/funny-free-roblox-t-shirtd_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/minecraft-free-apk_GM479516143.pdf
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-link-today_GM406889139.pdf
    • https://dolphintour.vn/images/uploadsfiles/robux-gratis-sin-hacks-2021_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/roblox-brown-free-hair-boy_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/farming-simulator-free-codes-roblox_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/how-to-change-roblox-username-for-free-2021_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/hack-roblox-online_GM431946152.pdf
    • https://dolphintour.vn/images/uploadsfiles/cheat-roblox-shark-bite_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031a2.bin
d6c5e23bd9fcbda64c0fdad146307cadfed70d0b5c10555679db45998dd46483
pdf-font-stream PDF embedded font (sfnt) at offset 0x31A2 22244 bytes
font_01_sfnt_off000062d6.bin
56fc0d64566fed4b540c374f1fcc8e2aeb8a537ad8f05ad1751f1466f961825e
pdf-font-stream PDF embedded font (sfnt) at offset 0x62D6 19428 bytes