Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3218a81010b3e3…

MALICIOUS

PDF

36.0 KB Created: 2021-06-26 04:02:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f4a1fbfe775a602dd49c85f3cf1c1948 SHA-1: bb4930a9d87dd065d0b68850587497f01e194303 SHA-256: de3218a81010b3e3261595bbf84eed07130343f6743c57b623b1c038e814dccc
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on iseas.com and appear to be part of a link farm. The primary URL, http://netcdn.co/app/431946152/free-robux-roblox-hack-no-survey-no-human-verification-2021-game-hack, suggests a lure for free Robux, likely leading to a malicious download. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further supports a malicious intent to trick users into downloading unwanted software.

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-roblox-hack-no-survey-no-human-verification-2021-game-hack
    • https://www.iseas.com/uploaded_files/userfiles/files/roblox-games-to-play-for-free_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/apps-to-get-free-robux_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/roblox-hack-exploit-no-virus_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/free-robux-infinity_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/minecraft-hacks-for-2b2t_GM479516143.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/como-hackear-cuentas-de-roblox-sin-programas_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/free-coin-spin_GM406889139.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-no-download_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/get-free-lives-on-coin-master_GM406889139.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/free-spin-link-coin-master_GM406889139.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/roblox-pink-free-robux_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/phantoms-forces-roblox-hack-weapon_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/free-roblox-robux-and-tix_GM431946152.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-online-hack_GM406889139.pdf
    • https://www.iseas.com/uploaded_files/userfiles/files/roblox-pillow-simulator-free-pillows_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003083.bin
3d1606b95c6eb2d556b9b78d7a68f11545068b83a6081ea084e993c72ff07966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3083 22980 bytes
font_01_sfnt_off0000640d.bin
72a15542368f3750cd465f8a19bf6baec8cfea421247d4d2423692937e546cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640D 20340 bytes

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