Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3d1397c374e1c3…

MALICIOUS

PDF

34.9 KB Created: 2021-06-27 01:12:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f6e11eb7d76881ba63b0b9711bed2e9a SHA-1: 30c20e1c5e157814153ed9f7f029d6ffa96d9e01 SHA-256: 5d3d1397c374e1c394cf7221d36aa8561ad21a501c04904be6867b9444888595
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links disguised as offers for free in-game currency and hacks, a common lure for phishing and malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly flagged this PDF as malicious. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful sites, likely to download further payloads or engage in credential harvesting.

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/how-to-get-free-unlimited-robux-on-roblox-2021-october-game-hack
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/free-money-links-coin-master_GM406889139.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-ios-apk_GM406889139.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/free-coin-master-cards_GM406889139.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/how-do-u-get-free-robux_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/microsoft-free-robux_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/how-to-easily-get-free-robux_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/roblox-royale-high-diamond-hack_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/hoe-to-get-free-robux-2021_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/get-robux-free-generator_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/spin-coin-master-hack_GM406889139.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/how-to-cheat-in-roblox-mad-paintball_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/minecraft-windows-10-edition-free-download_GM479516143.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/collect-free-spins-for-coin-master_GM406889139.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/but-link-says-free-robux_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/hack-774-roblox_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/roblox-strucid-battle-royale-aimbot-hack_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/roblox-admin-hack_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003047.bin
7ddf1241087ce5c965e70704b8b3b643ae3e8daa30a32ff36c048f33b711329b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3047 21900 bytes
font_01_sfnt_off000060ab.bin
188a8c3ffff492704c96cd71c063eedd551559ceeb8893bf6c28a01dc36ac2f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AB 20012 bytes

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