Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e17fca6ce9b848…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 16:18:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9568a9b9241efa73eb302fb02970464e SHA-1: 66ec9be31a67d7baa33d4063c1a58fe2f2f9c1b8 SHA-256: 21e17fca6ce9b8487295ce6b782f9d0296aa2980ced8f2e1eeecb80524899451
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are related to game hacks and free in-game currency, indicating a link farm or phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains references to 'free Robux' and a URL that aligns with the malicious link farm heuristic.

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.online/app/431946152/games-that-give-you-free-robux-game-hack
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spin-app-reviews_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdf
    • https://www.andrology.co.uk/uploads/files/files/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-hack_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/coin-master-link-today_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-daily-2021_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/minecraft-free-online-games_GM479516143.pdf
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-2021-robux-for-free_GM431946152.pdf
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-and-coins-generator_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/300-free-spins-coin-master_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/master-coin-hack-app_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/daily-coin-master-free-spins_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-without-human-verification_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/hack-xp-net-coin-master_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/free-minecraft-com_GM479516143.pdf
    • https://www.andrology.co.uk/uploads/files/files/how-to-hack-a-minecraft-server_GM479516143.pdf
    • https://www.andrology.co.uk/uploads/files/files/free-coin-master-spins-blogger_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/free-spins-coin-master-daily_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/daily-spins-coin-master_GM406889139.pdf
    • https://www.andrology.co.uk/uploads/files/files/roblox-svg-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005277.bin
967eeffe4d89c869f95566ce0cbe7670498974b97fef0c6b1d3c391ab2eeccd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5277 25072 bytes
font_01_sfnt_off00008c57.bin
c4d6735542cd49b50f18b2921f89e54fe5d8ee4af3f47c61005942af246faebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C57 19168 bytes