Malicious PDF — malware analysis report

Static analysis result for SHA-256 757d2a455306ae1b…

MALICIOUS

PDF

34.7 KB Created: 2021-07-03 19:56:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 784a9be1ef79ea85f8dd7356c8d5ea93 SHA-1: 54eea82021c5330357066780ebc14856dc5a3a10 SHA-256: 757d2a455306ae1b8bbab2860ad3103bee94bf8fe6d29d20c4ce3b5a8373226f
122 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to sites offering game hacks and cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier strongly flagged this PDF as malicious. The document's content and structure suggest a phishing or scam attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/431946152/roblox-games-with-free-boombox-game-hack
    • https://www.vista-design.hr/files/free-roblox-soldier-gfx-ww2-german_GM431946152.pdf
    • https://www.vista-design.hr/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdf
    • http://www.vista-design.hr/files/unlimited-spin-coin-master-hack_GM406889139.pdf
    • https://www.vista-design.hr/files/how-to-hack-roblox-accounts-december-2021_GM431946152.pdf
    • http://www.vista-design.hr/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdf
    • https://www.vista-design.hr/files/coin-master-hack-game-download-mod-apk_GM406889139.pdf
    • http://www.vista-design.hr/files/roblox-game-studio-unblocked-cheats-download-guide-unofficial-chala-dar_GM431946152.pdf
    • https://www.vista-design.hr/files/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • http://www.vista-design.hr/files/good-hacks-to-do-with-a-hang-glider-roblox-treelands_GM431946152.pdf
    • https://www.vista-design.hr/files/roblox-free-roming-camera_GM431946152.pdf
    • https://www.vista-design.hr/files/free-robux-no-anti-bot-verification_GM431946152.pdf
    • http://www.vista-design.hr/files/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • https://www.vista-design.hr/files/robux-page_GM431946152.pdf
    • https://www.vista-design.hr/files/free-robux-kid-friendly_GM431946152.pdf
    • http://www.vista-design.hr/files/hacks-for-minecraft-bedrock_GM479516143.pdf
    • https://www.vista-design.hr/files/free-roblox-accounts-v3rmillion-2021-august_GM431946152.pdf
    • http://www.vista-design.hr/files/www-coin-master_GM406889139.pdf
    • https://www.vista-design.hr/files/free-robux-exe_GM431946152.pdf
    • http://www.vista-design.hr/files/free-robux-wheel_GM431946152.pdf
    • https://www.vista-design.hr/files/minecraft-free-download-windows_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f77.bin
f553fd80cffbb23351bad44cf94379459011e7de8a2c62d46eed579034a6e134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F77 22360 bytes
font_01_sfnt_off00006148.bin
1fe97cacaf87faaf7e87019df11dc5da97cf6ecddb8fd4c97aefa44281928813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6148 19496 bytes

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