Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce8d061d2e5435e…

MALICIOUS

PDF

46.8 KB Created: 2021-05-14 04:05:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 662203ccbbfe26265dd22d7722becda1 SHA-1: ac731306ad5926f8c96d9c484933bbfe96a29a64 SHA-256: bce8d061d2e5435ea1e176f27efdf8f3b687d43b25313d3863f809ce3ee5412c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites offering 'free spins', 'robux', or 'hacks' for popular games. The primary URL, https://netcdn.xyz/app/406889139/how-many-free-spin-links-is-there-for-coin-master-game-hack, and many others hosted on bzconstructionservices.com, suggest a link farm designed to attract users with promises of in-game advantages. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/406889139/how-many-free-spin-links-is-there-for-coin-master-game-hack
    • http://www.bzconstructionservices.com/images/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/minecraft-fly-hack_GM479516143.pdf
    • http://www.bzconstructionservices.com/images/how-to-hack-coin-master-spin_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/free-spin-coin-master-link-download_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/free-robux-games-that-actually-work_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/free-minecraft-capes-no-mods_GM479516143.pdf
    • http://www.bzconstructionservices.com/images/roblox-april-fools-hack_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/free-robux-2021-no-verification_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/minecraft-login-free_GM479516143.pdf
    • http://www.bzconstructionservices.com/images/coin-master-hack-spins-ios_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/spin-and-coin_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/how-to-hack-in-arsenal_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/roblox-skins-boy-free_GM431946152.pdf
    • http://www.bzconstructionservices.com/images/best-hacked-client_GM479516143.pdf
    • http://www.bzconstructionservices.com/images/free-spin-link-for-coin-master_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/best-coin-master-hack_GM406889139.pdf
    • http://www.bzconstructionservices.com/images/how-to-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000481f.bin
f3c3becda35816691cf12c0379eb751b56687f74a21a9201a55b0ab739422569		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x481F 31412 bytes
font_01_sfnt_off00008a26.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A26 2840 bytes
font_02_sfnt_off000093d7.bin
570b0c61311575f79f3042bd24f9f673b4866dc3d196f598a36d155a291d7be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93D7 18564 bytes

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