Malicious PDF — malware analysis report

Static analysis result for SHA-256 8327207b250fa0a9…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 08:29:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 556f9613be4d6cc8951372399205d64d SHA-1: f80e273a9817cd551f931539e131bbe30d7a0e89 SHA-256: 8327207b250fa0a99d82f7b43bcc43aa30ea7ee5c457d388b8da3522251b5b1a
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm designed to appear as legitimate content. It also presents a fake CAPTCHA or human verification prompt to trick users into interacting with the document. The presence of these elements, combined with a high ML classifier score, indicates a malicious intent to redirect users to potentially harmful websites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/roblox-robux-hack-game-hack
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-free-spin-no-offers_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-spins-coin-master-without-completing-offers_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-get-free-robux-com_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-rare-cards-for-coin-master-christmas_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/oprewards-com-login_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-robux-generator-for-kids_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/robuxy-com-free-robux_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/cool-free-roblox-outfits_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-do-you-get-roebucks_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/minecraft-realms-free-codes_GM479516143.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/www-roblox-com-free-robux_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/minecraft-pe-hack-client-ios_GM479516143.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-free-spins-2021-hack_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-tiktok-likes-2021_GM835599320.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-minecraft-server_GM479516143.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/minecraft-pe-free-download_GM479516143.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/easy-coin-master-hack_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-roblox-executor-no-key_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fdd.bin
1a9025534e265b1da5b14641d22518203347e1fbc7a393f30088d923a9967af1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FDD 24844 bytes
font_01_sfnt_off0000893d.bin
fa424f86a9ddd472d540fc30f07119be4b576a9306b5f7bb82c207f2bb92a2b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x893D 18320 bytes

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