Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19e9d84da5cd33f…

MALICIOUS

PDF

49.0 KB Created: 2021-06-08 23:26:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 666519efebc52ad93d41f547e9e69e97 SHA-1: e6c687f72ef42dda922a87d283fe3e864336d84f SHA-256: b19e9d84da5cd33fc94490bb4076fdb9b4b334d4e8d4b6fc55e7955b3a52cd80
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are structured to appear as SEO-optimized content, suggesting a link farm or SEO manipulation tactic. One prominent link points to a URL related to 'free black hair in Roblox', which is a common lure for malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URIs and the link farm heuristic indicate a high likelihood of the document being used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/how-to-get-free-black-hair-in-roblox-game-hack
    • http://ellobo.com.ua/ckfinder/userfiles/files/official-coin-master-free-spins_GM406889139.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links-home_GM406889139.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/free-spins-coin-master-november-2021_GM406889139.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/how-to-get-free-coins-in-minecraft_GM479516143.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/free-robux-gift-card-codes-2021_GM431946152.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/how-to-get-free-robux-without-surveys_GM431946152.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/roblox-land-free-robux_GM431946152.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/roblox-studio-free-robux_GM431946152.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/minecraft-account-hacked_GM479516143.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/free-spins-coin-master-legit_GM406889139.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/25-free-spins-coin-master_GM406889139.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/hack-coin-master-spin_GM406889139.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/how-you-get-free-robux_GM431946152.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/free-roblox-accounts-with-builders-club_GM431946152.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/how-to-download-wurst_GM479516143.pdf
    • http://ellobo.com.ua/ckfinder/userfiles/files/coin-master-cheat-engine-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052fc.bin
fa9c83e4a137f165e2ee0ab963fdb27acc85089cf981ce0a6331729f13468c16		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52FC 26152 bytes
font_01_sfnt_off00008eae.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAE 3884 bytes
font_02_sfnt_off00009b55.bin
eb60026da59f1e9b982ee0d243bc775cd24ca2bd24bec2dcb8b0a1d5ca1a16c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B55 18736 bytes

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