Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a1994ff8649548…

MALICIOUS

PDF

35.5 KB Created: 2021-06-29 13:44:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ad49ac4a8e26e5a34424a9279571c9a9 SHA-1: 12ce5ae5c31dda41583a25fddba95ae3177648a6 SHA-256: c4a1994ff864954808330ba418918ec454aca98c1cea716f2328e430d6f47a53
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are related to game hacks and free in-game items, suggesting a lure for users to download potentially malicious content. The ML classifier also strongly indicated maliciousness. The primary IOC is the embedded URL http://netcdn.co/app/431946152/set-you-free-roblox-id-game-hack, which likely serves as a 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/set-you-free-roblox-id-game-hack
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-get-a-free-minecraft-account_GM479516143.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-free-tony-stark-tshirt_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/download-hack-coin-master-apk_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-lumber-tycoon-2-axe-hack_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-tiradas-gratis-link_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/mcpe-free-download_GM479516143.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/can-i-play-roblox-free_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/coinmaster-hack_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-get-free-clothes-roblox-2021_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-server-hack_GM406889139.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-hack-gear-into-roblox-games_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/destruction-simulator-codes-roblox-hack-para_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-free-draw-2-how-to-get-good-drawings_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-free-your-audio-roblox_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/free-online-minecraft-server_GM479516143.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/free-robux-generator-without-human-verification_GM431946152.pdf
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031b5.bin
92ceb4bdfc957bb7a2756bb74ab61aecba56daaf8dad284a466dfb41a7015fa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31B5 22840 bytes
font_01_sfnt_off00006544.bin
7e8c2514ffe23868e11025cb8d1af73a508015371a7bef9174cb06f17df7d090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6544 19232 bytes

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