Malicious PDF — malware analysis report

Static analysis result for SHA-256 155f81e16c582bfa…

MALICIOUS

PDF

34.0 KB Created: 2021-06-19 13:27:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 177c9fa4dccd5e6c62389e3f804bdde5 SHA-1: bd80ec4951d9e790b11197f5ba722508a208e5ad SHA-256: 155f81e16c582bfa5dd5fab2dca7479ddf4f2668cb6d8a049aaca619f8fbef1f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many of which are presented as PDF files promising hacks or free items for games like Robux and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm designed to attract users with deceptive promises. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is intended to lead users to potentially harmful content.

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-no-human-verification-real-game-hack
    • https://ciudadata.ec/images/ckfinder/files/coin-master-hack-without-verification-code_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • https://ciudadata.ec/images/ckfinder/files/coin-master-hack-2021-free_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/today-coin-master-spin-free_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/roblox-insta-arrest-hack-jailbreak-pastesbin_GM431946152.pdf
    • https://ciudadata.ec/images/ckfinder/files/haktuts-coin-master-free-spin-link-today_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/how-can-you-get-robux_GM431946152.pdf
    • https://ciudadata.ec/images/ckfinder/files/20-free-spins-coin-master_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/master-coin-hack-game_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/60-free-spins-coin-master_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/minecraft-for-free-apk_GM479516143.pdf
    • https://ciudadata.ec/images/ckfinder/files/facebook-coin-master-free-spins_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdf
    • https://ciudadata.ec/images/ckfinder/files/free-hair-roblox-blue_GM431946152.pdf
    • https://ciudadata.ec/images/ckfinder/files/2021-free-coin-master-spins_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/minecraft-free-install_GM479516143.pdf
    • https://ciudadata.ec/images/ckfinder/files/coin-master-free-spin-bonus_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • https://ciudadata.ec/images/ckfinder/files/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fb8.bin
5f10b92cd370c5f5212a0851a5f87861156ba3ad46b24688bd36a7b634e8484a
pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB8 21480 bytes
font_01_sfnt_off00005ead.bin
e06d1c3fa9dd44295ecd678165113c78cd8525d8cf4c3b63cd6442a17f33539f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAD 19408 bytes