Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ad1bec31ef8b85…

MALICIOUS

PDF

36.3 KB Created: 2021-07-04 11:44:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c38cfbfc7049340571a88e5e7df25ce6 SHA-1: aa9d3376805a3b9cb0ce33a81c7cc063af61d8af SHA-256: b2ad1bec31ef8b85bc8269d282ba806285a6342c1a726c295fe214238f4196de
102 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as SEO link farms, suggesting a deceptive intent to drive traffic. The document body and extracted URLs explicitly mention 'free Robux' and game hacking, indicating a lure for potentially malicious downloads or scams. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a deceptive attack pattern.

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/431946152/how-to-get-free-robux-no-human-verification-2021-game-hack
    • https://www.nordicstar.co.uk/uploads/files/files/can-you-download-minecraft-for-free_GM479516143.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/what-games-give-you-robux_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-accounts-for-sale-free_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-game-hacking_GM406889139.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-robux-without-verification_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-free-robux-hack-no-verify-download_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/pokemon-go-free-friend-codes_GM1094591345.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/how-do-you-hack-on-roblox-2021_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/corn-master_GM406889139.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-free-download_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-bloxbux-in-roblox_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/free-coin-spin_GM406889139.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-in-edit-game-hack-gui_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-cards-link_GM406889139.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-svg-free_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/best-free-robux-sites_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-wings-in-roblox-2021_GM431946152.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/pubg-uc-price-in-nepal_GM1330123889.pdf
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-games-on-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_off0000329d.bin
7b98872d4ebe2c2fd095d12a6ae6da24955558ac724f6b3ffba7834387dc972b
pdf-font-stream PDF embedded font (sfnt) at offset 0x329D 23116 bytes
font_01_sfnt_off00006643.bin
071133fbd72890720303c8ecaa5d80d0b8671e9ee25b91c9a58bd6e8411eacd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6643 19900 bytes