Malicious PDF — malware analysis report

Static analysis result for SHA-256 815d74fc6f12a1bc…

MALICIOUS

PDF

35.1 KB Created: 2021-06-28 00:43:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6330bff14efcd12c22dac8ca8d0f831f SHA-1: 2f862428b509948a18501b03916e00f5a1906d48 SHA-256: 815d74fc6f12a1bcdf555aa23c854c680ebb00aeb7186d71a34881e41a5c0187
102 Risk Score

Malware Insights

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

This PDF document contains numerous links, including one to 'netcdn.co/app/431946152/free-script-runner-for-roblox-game-hack', suggesting a lure for users interested in game cheats or hacks. The presence of a large number of external PDF links, many with numeric slugs, indicates a link farm designed to attract traffic. The ML classifier also flagged this PDF as malicious with high confidence.

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-script-runner-for-roblox-game-hack
    • http://www.elsire.co.in/uploaded_files/userfiles/files/rewardrobux-com_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-minecraft-mods-for-ps4_GM479516143.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/best-free-hacked-client_GM479516143.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/coin-master-daily-spin-free_GM406889139.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/pubg-uc-account_GM1330123889.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/collect-free-spin-linms-coin-master_GM406889139.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/coin-master-link_GM406889139.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/get-me-free-robux_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-to-inject-roblox-hacks_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/roblox-robux-hack-cheat-engine-62-2021_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-2021-hack_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-full-colour-brown-pant-roblox_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/apps-for-free-spins-on-coin-master_GM406889139.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-to-get-a-lot-of-robux_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/roblox-gift-card-generator-hack_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/coin-master-hack-ios-app_GM406889139.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/roblox-free-robux-website_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003202.bin
75e74b2652fa1b3a3b830e5e4b79a34a05d85fcb16eaec849d5ca4319e47f3a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3202 22364 bytes
font_01_sfnt_off000063c2.bin
7ff708c3131a1e265eb6d3e213d6a748ee0c079388aa86fbc335299519f9b008		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C2 19192 bytes

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