Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5fb65c828a536b…

MALICIOUS

PDF

44.4 KB Created: 2021-05-14 03:32:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 52407b73834e9e3eaffabccbf7a81e7e SHA-1: 83605331eded373c7472fe2281de2094242f2db1 SHA-256: 9d5fb65c828a536b48b09176d47d19accd38a9d26fbc7c90e90f0e05f16a08b0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO link farms for game hacks and 'free Robux'. The ML classifier strongly indicates maliciousness, and the presence of a direct download URL suggests the document is designed to lead users to malicious content or further malware. The document body itself is heavily obfuscated but contains references to 'free Robux' and game hacks, reinforcing the lure.

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 https://netcdn.xyz/app/431946152/free-robux-come-game-hack
    • https://hotelartskathmandu.com/userfiles/files/free-robux-without-doing-anything_GM431946152.pdf
    • https://hotelartskathmandu.com/userfiles/files/roblox-hack-site_GM431946152.pdf
    • https://hotelartskathmandu.com/userfiles/files/coin-master-gold-cards-free_GM406889139.pdf
    • https://hotelartskathmandu.com/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • https://hotelartskathmandu.com/userfiles/files/how-to-get-free-hair-on-roblox-2021_GM431946152.pdf
    • https://hotelartskathmandu.com/userfiles/files/minecraft-build-hacks_GM479516143.pdf
    • https://hotelartskathmandu.com/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • https://hotelartskathmandu.com/userfiles/files/windows-10-minecraft-hacks_GM479516143.pdf
    • https://hotelartskathmandu.com/userfiles/files/free-daily-spins-coin-master_GM406889139.pdf
    • https://hotelartskathmandu.com/userfiles/files/coin-mast-hacks_GM406889139.pdf
    • https://hotelartskathmandu.com/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdf
    • https://hotelartskathmandu.com/userfiles/files/coin-master-free-link-app_GM406889139.pdf
    • https://hotelartskathmandu.com/userfiles/files/how-to-get-free-robux-games_GM431946152.pdf
    • https://hotelartskathmandu.com/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdf
    • https://hotelartskathmandu.com/userfiles/files/free-pe_GM479516143.pdf
    • https://hotelartskathmandu.com/userfiles/files/roblox-character-free_GM431946152.pdf
    • https://hotelartskathmandu.com/userfiles/files/wahoo-gaming-co-free-robux_GM431946152.pdf
    • https://hotelartskathmandu.com/userfiles/files/minecraft-bedrock-free-server-hosting_GM479516143.pdf
    • https://hotelartskathmandu.com/userfiles/files/juego-hackeado-de-coin-master_GM406889139.pdf
    • https://hotelartskathmandu.com/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004917.bin
6aa7fc5a23269eb1662e757e3766ae493f0a42e47d63b88cadf31d85cae2ce95		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4917 29032 bytes
font_01_sfnt_off00008ba2.bin
d7491fe45cc88596c87233a963b6162720bf27c142cea717df16fbc09fa29ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA2 18276 bytes

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