Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a91bf3fa05cde5e…

MALICIOUS

PDF

44.5 KB Created: 2021-06-10 23:30:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 07da744e0a636c153591d7242a510a6e SHA-1: 75efa1b0219fbf3fd9560469fad077ed1267b6f8 SHA-256: 4a91bf3fa05cde5e6e0613b3eb2ca446a56521650c2b4729a278158a8c2a10b1
102 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as SEO-optimized links pointing to other PDF files, suggesting a link farm designed to attract users searching for game cheats or hacks. The presence of a specific URL related to 'roblox-cheat-buddy-aimbot-script-game-hack' and the ML classifier flagging the PDF as malicious indicate a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to game cheats and a URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/roblox-cheat-buddy-aimbot-script-game-hack
    • http://subarulegacy.com/images/free-robux-games_GM431946152.pdf
    • http://subarulegacy.com/images/coin-master-ios-gods-hack_GM406889139.pdf
    • http://subarulegacy.com/images/coin-master-hack-pc-download_GM406889139.pdf
    • http://subarulegacy.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://subarulegacy.com/images/minecraft-for-ps3-free_GM479516143.pdf
    • http://subarulegacy.com/images/free-robux-generator-no-survey_GM431946152.pdf
    • http://subarulegacy.com/images/free-robux-that-actually-works-2021_GM431946152.pdf
    • http://subarulegacy.com/images/check-cashed-roblox-hack-download_GM431946152.pdf
    • http://subarulegacy.com/images/can-you-get-robux-for-free_GM431946152.pdf
    • http://subarulegacy.com/images/get-free-spins-for-coin-master_GM406889139.pdf
    • http://subarulegacy.com/images/free-robux-with-no-human-verification_GM431946152.pdf
    • http://subarulegacy.com/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://subarulegacy.com/images/coin-master-free-spins-link-march-2021_GM406889139.pdf
    • http://subarulegacy.com/images/coin-master-hacks-2021_GM406889139.pdf
    • http://subarulegacy.com/images/como-hackear-juego-coin-master_GM406889139.pdf
    • http://subarulegacy.com/images/hack-game-plus-com-coin-master_GM406889139.pdf
    • http://subarulegacy.com/images/free-minecraft-java-edition-codes_GM479516143.pdf
    • http://subarulegacy.com/images/earn-free-robux-today_GM431946152.pdf
    • http://subarulegacy.com/images/hack-coin-master-without-verification_GM406889139.pdf
    • http://subarulegacy.com/images/free-robux-hack-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050cd.bin
cf3e990f9ebe300b356c31d5054475fb6ec62859ad3f662ce7d58e8490e1e72a
pdf-font-stream PDF embedded font (sfnt) at offset 0x50CD 24564 bytes
font_01_sfnt_off0000883f.bin
5ab96da8ab43257706fa4ed50cbfe9e2017d53236b0df20d4f46940740f85f57
pdf-font-stream PDF embedded font (sfnt) at offset 0x883F 19332 bytes