Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9337816ea6d06c1…

MALICIOUS

PDF

45.3 KB Created: 2021-06-07 00:03:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 80795f7dc775ec54e45b19a67ea88452 SHA-1: 8a77e27cd2f0c3c872de6ab82487c54f46792117 SHA-256: d9337816ea6d06c1d94da6e49fd8ae0e6f109eb85614dc78819825f4590c4e07
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to external resources related to game cheats and hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting an attempt to drive traffic to potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the document's structure and embedded URLs strongly suggest it's designed to trick users into downloading further malicious content or visiting compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/how-to-cheat-in-roblox-2021-game-hack
    • http://www.sfakia-online.com/images/minecraft-pe-hack-client_GM479516143.pdf
    • http://www.sfakia-online.com/images/coin-master-free-spins-daily-1-ga_GM406889139.pdf
    • http://www.sfakia-online.com/images/free-robux-instantly_GM431946152.pdf
    • http://www.sfakia-online.com/images/coin-master-hack-tool-ios_GM406889139.pdf
    • http://www.sfakia-online.com/images/pokemon-go-free-hack_GM1094591345.pdf
    • http://www.sfakia-online.com/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.sfakia-online.com/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • http://www.sfakia-online.com/images/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://www.sfakia-online.com/images/how-to-hack-roblox-accounts_GM431946152.pdf
    • http://www.sfakia-online.com/images/robux-hack-generator_GM431946152.pdf
    • http://www.sfakia-online.com/images/free-coin-master-s_GM406889139.pdf
    • http://www.sfakia-online.com/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdf
    • http://www.sfakia-online.com/images/minecraft-bedrock-free_GM479516143.pdf
    • http://www.sfakia-online.com/images/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://www.sfakia-online.com/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdf
    • http://www.sfakia-online.com/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • http://www.sfakia-online.com/images/coin-master-free-spins-cheat_GM406889139.pdf
    • http://www.sfakia-online.com/images/oprewards-com-earn_GM431946152.pdf
    • http://www.sfakia-online.com/images/how-to-get-free-roblox-money_GM431946152.pdf
    • http://www.sfakia-online.com/images/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051b5.bin
bf8972b7c20c0d48d0dd39b765e56bd9d2428e5ff7f269d23190bbe4f4b57999
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B5 25408 bytes
font_01_sfnt_off00008cc0.bin
4570f9290f6e369a495c066d75d7a2add5183e2298abfab9e861aad6e431b3fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC0 18848 bytes