Malicious PDF — malware analysis report

Static analysis result for SHA-256 377ae2cfe319621a…

MALICIOUS

PDF

43.9 KB Created: 2021-06-13 18:39:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 76cd5f5a6b398b8777a8d42db9c87845 SHA-1: 6a6829f68337f8eeef70c6252634807df591da1e SHA-256: 377ae2cfe319621a3cccd3f8d4bf94b306b131ef333de0ca6a22e7916aa7b111
102 Risk Score

Malware Insights

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

The PDF contains embedded links and a document body that attempts to lure the user into downloading a file by promising free in-game currency. The ML classifier and the presence of a link farm strongly indicate malicious intent. The primary IOC is the URL http://netcdn.co/app/431946152/free-robux-exe-game-hack, which likely hosts the malicious executable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-exe-game-hack
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-minecraft-windows-10_GM479516143.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/free-robux-for-roblox-2021-genorat-no-human-verification_GM431946152.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/blogspot-coin-master-free-spins_GM406889139.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/free-robux-with-no-verification-2021_GM431946152.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/free-robux-only-username_GM431946152.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/tiktok-free-fans-2021_GM835599320.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-without-verification-code-2021_GM406889139.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/minecraft-pe-hack-client-2021_GM479516143.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-without-verify_GM406889139.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/websites-that-give-free-robux_GM431946152.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/how-do-i-hack-steam-to-get-free-robux_GM431946152.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/is-coin-master-hack-safe_GM406889139.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/coin-master-free-cards-hack_GM406889139.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/free-spins-and-coins-com_GM406889139.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-blogspot_GM406889139.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/free-robux-pin-codes_GM431946152.pdf
    • https://www.hortonstmichaels.co.uk/admin/ckfinder/userfiles/files/coin-master-hacks-no-downloading_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d4f.bin
d155ae90ce3137c5bb28485e847ac69b034109caca3b6af3c5a9d64da7125b9b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D4F 25760 bytes
font_01_sfnt_off00008980.bin
67527198e8f3e954f788e220fdc5e0efc04c24ca5928f64c044788dd6707c9fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8980 18200 bytes

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