Malicious PDF — malware analysis report

Static analysis result for SHA-256 92474143bfc28124…

MALICIOUS

PDF

45.0 KB Created: 2021-05-14 01:09:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 71b6ff9c20835993f19a504f67fc5b64 SHA-1: 5a929bbb68cc2500295e549bce2430cc22d4a3ea SHA-256: 92474143bfc28124f00be67488afd08f023deb88921f7b53e1e7fb460e3e4a90
102 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm designed to attract users. The presence of a 'download button' heuristic further supports the idea that the document is intended to trick users into downloading malicious content. The ML classifier also strongly indicated maliciousness.

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/479516143/free-minecraft-server-hosting-24-7-game-hack
    • https://www.anders-sofa.com.tw/uploadpic/files/minecraft-hack-2021_GM479516143.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/free-spins-on-coin-master-link_GM406889139.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-free-spins-hack-link_GM406889139.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/get-free-robux-info_GM431946152.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/demon-roblox_GM431946152.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/how-can-i-play-minecraft-for-free_GM479516143.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-hack-coin-master-2021_GM406889139.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-hack-cheat-generator-d_GM406889139.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-host-a-minecraft-server-for-free_GM479516143.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-hack-spin-generator-tool_GM406889139.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-hack-2021-iphone_GM406889139.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/get-free-roblox_GM431946152.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/free-robux-gift-card-codes_GM431946152.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-get-free-robux-without-verification_GM431946152.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/roblox-promo-codes-2021-robux_GM431946152.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-get-minecraft-for-free-on-computer_GM479516143.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-get-free-robux-hack_GM431946152.pdf
    • https://www.anders-sofa.com.tw/uploadpic/files/rewards-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_off0000500a.bin
eba32815647684eaa1431e8e272ff04290c509420b1706bccf2de93d93d566a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x500A 29844 bytes
font_01_sfnt_off00008d94.bin
91a7490c887560cf1db9cb18ebb1e2a98db2d1ca6a1740dfb9f9cb38742cb9c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D94 18352 bytes