Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac7620fb743dbb2…

MALICIOUS

PDF

32.9 KB Created: 2021-06-22 02:15:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 28a452c6ed171d849181038f3f8dc1f9 SHA-1: b8ff540ac71cf5331e6b8909337cd1b6c2131886 SHA-256: 2ac7620fb743dbb23841aa5b480ab3fddb7dadf7f4c406f7becf7a2aefad65e4
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are presented as guides for game hacks and cheats, suggesting a lure for users to download potentially malicious files. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a link farm further supports a malicious intent. The document's content and structure indicate it's designed to trick users into clicking links that likely lead to malware or exploit delivery.

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/jailbreak-hacks-for-roblox-game-hack
    • http://www.repion.com/uploaded_files/userfiles/files/www-coin-master-hack_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-get-free-roblox-money_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-free-coin-hack_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-get-free-obc-and-robux-in-roblox_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/is-minecraft-free-on-ps4_GM479516143.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-spins-gratis_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-hack-coin-master-game-ios_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/free-robux-promo-codes-2021_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/free-robux-without-human-verification-website_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/all-free-items-in-roblox_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/can-u-get-free-robux_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/free-spins-coinmaster_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/pubg-uc-to-pkr_GM1330123889.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/go-to-robux-free-gift-card_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-hacks-for-pet-food_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-free_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-free-coins-today_GM406889139.pdf
    • http://www.repion.com/uploaded_files/userfiles/files/free-halloween-costumes-for-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002df3.bin
b9c59cd901e4426a6810925af66f501db2e889acfc6abf7e9c5bcad5e512bfe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2DF3 21008 bytes
font_01_sfnt_off00005b76.bin
6e39c4ba3c9b17ba9a6de9beaee503551c45453913e37f5ba526606beb27e973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B76 19104 bytes

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