Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9b55155b37bba2…

MALICIOUS

PDF

36.3 KB Created: 2021-07-03 13:29:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 560ebe9189607c510ef1ad41e9e1d6e5 SHA-1: 58cf5f55a38bb765330c9fa0c756740c72e79c74 SHA-256: 7c9b55155b37bba2f8989f66f3b8f8cdc02dc45bd6f57a1609447db06453840d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external resources, including one directly pointing to a downloadable application related to 'coin-master-spin-cheat-game-hack'. The presence of a large number of SEO-optimized PDF links on unrelated topics suggests a link farm designed to distribute 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 http://netcdn.tw/app/406889139/coin-master-spin-cheat-game-hack
    • https://knowledgekingdom.com.jo/aidata/blanc/files/hacken-on-roblox_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-to-buy-robux-free-on-roblox_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/free-minecraft-account-and-password-2021_GM479516143.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/free-robux-please_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/get-free-shirts-on-roblox_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/hack-roblox-game-ability_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-to-get-btools-and-speed-hack-in-roblox-jailbreak_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/www-roblox-com-robux-free_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-free-spin-daily-link_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-to-get-free-robux-no-verification-ios_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-hack-tool-v1-9-download_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/robux-hack-no-download_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/get-free-minecraft-account_GM479516143.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-free-spins-promo-code_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-do-you-get-roblox-for-free_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-to-get-hacks-for-roblox-jailbreak_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-strategy_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/roblox-free-exploit-dex_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000393b.bin
42acdc4d62ca72a6c5eece9aa70ef39308e1ff44f2417066f4c45a56f0d5b025
pdf-font-stream PDF embedded font (sfnt) at offset 0x393B 22536 bytes
font_01_sfnt_off00006b78.bin
3199fee58fbf128b0b7204f9060370fea0cf5ccd916deac964171f15d58e92c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B78 18176 bytes