Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cc5c1f0e7c29c2…

MALICIOUS

PDF

40.9 KB Created: 2021-05-17 21:32:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: df304a94cb3d76c1992de91c9f021b0d SHA-1: a43364a2c9629124c69a65b32c15d910a0447947 SHA-256: b5cc5c1f0e7c29c28ece5865efb911334669d1b67dc4c64f1ed61ee06e9f7349
142 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a fake CAPTCHA lure, strongly suggesting a social engineering attack. The ML classifier also flagged this PDF as malicious with high confidence. The document body and extracted URLs point towards a scam related to game hacks and cheats, likely intended to trick users into downloading malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-free-fire-game-hack
    • http://ehma.com/images/roblox-free-pants_GM431946152.pdf
    • http://ehma.com/images/hack-coins-in-coin-master_GM406889139.pdf
    • http://ehma.com/images/mcpe-master-unlimited-coins-free-download_GM406889139.pdf
    • http://ehma.com/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://ehma.com/images/what-are-points-for-in-roblox_GM431946152.pdf
    • http://ehma.com/images/roblox-script-executor-free_GM431946152.pdf
    • http://ehma.com/images/robux-robux_GM431946152.pdf
    • http://ehma.com/images/daily-free-spins-on-coin-master_GM406889139.pdf
    • http://ehma.com/images/how-to-get-hacks-on-roblox_GM431946152.pdf
    • http://ehma.com/images/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdf
    • http://ehma.com/images/coin-master-hack-download-2021_GM406889139.pdf
    • http://ehma.com/images/links-for-free-spins-for-coin-master_GM406889139.pdf
    • http://ehma.com/images/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://ehma.com/images/minecraft-java-code-free_GM479516143.pdf
    • http://ehma.com/images/free-robux-with-no-verification_GM431946152.pdf
    • http://ehma.com/images/free-spins-coin-master_GM406889139.pdf
    • http://ehma.com/images/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://ehma.com/images/free-robux-generator-2021-no-human-verification_GM431946152.pdf
    • http://ehma.com/images/old-roblox-accounts-for-free_GM431946152.pdf
    • http://ehma.com/images/roblox-trolling_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004719.bin
71dc95de1d01a80c276fec4f7f77020a06bd957b776f9c48b3f75a74cd961e7c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4719 24564 bytes
font_01_sfnt_off00007eff.bin
0afd6f2792edb83b7f2a0201a1e0a5eb12ca81ad868fb3e42742340ee6e5fb0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFF 17712 bytes

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