Malicious PDF — malware analysis report

Static analysis result for SHA-256 2159cf635f0511f2…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 07:09:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e4364867427c860b5e1b6dcdce4b4696 SHA-1: 1d83032227ee9ddcf94f47e9b799cef5e6f83f94 SHA-256: 2159cf635f0511f24220b6a8cfe2e6ba9f2bf7b757770cfb1985a32725f94d91
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, forming a link farm, with a primary URL pointing to a 'Free Robux Generator'. The document body and heuristics indicate a lure for users to download content, likely malicious, under the guise of game cheats. The ML classifier strongly flagged this PDF as malicious, supporting the observed malicious intent.

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.tw/app/431946152/free-robux-generator-2021-game-hack
    • https://jogjaindotrans.com/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/free-robux-tycoon_GM431946152.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/how-hack-in-roblox-games_GM431946152.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/roblox-t-shirt-free-shipping_GM431946152.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/build-a-boat-roblox-hack_GM431946152.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/free-coins-on-coin-master_GM406889139.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/pokemon-go-free-999_GM1094591345.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/did-tofuu-het-roblox-hacked_GM431946152.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/how-to-get-free-admin-in-roblox_GM431946152.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/free-robux-no-inspect_GM431946152.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/how-to-get-free-models-in-roblox-studios_GM431946152.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/roblox-cheat-with-fake-paypal-checkout_GM431946152.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/free-tiktok-likes-and-followers_GM835599320.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/what-will-happen-if-you-hack-for-robux_GM431946152.pdf
    • https://jogjaindotrans.com/ckfinder/userfiles/files/free-coin-master-spins-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000314c.bin
f017a6d90812c037bb9c7c1b5d0bbe54c077e3cc7d06a4a31c84a23c77027342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x314C 22212 bytes
font_01_sfnt_off000062cc.bin
e428ca4c21c8feda58ff9d2cee9e63eb7b19a929803cf1f6eebeef0755d1c14a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CC 19224 bytes

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