Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36caecaa1d1e47a…

MALICIOUS

PDF

34.8 KB Created: 2021-06-18 07:51:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5e45492aa43612e6b49b6cddd2982b49 SHA-1: 530734b6962d9e757757f4de58d74354cff14612 SHA-256: b36caecaa1d1e47a315fb337dccd33d44c2d011ced9681c737412aedebc55223
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external PDF files, many of which appear to be SEO spam related to game cheats and free items. The primary URL http://netcdn.co/app/431946152/roblox-cute-girl-outfits-free-game-hack suggests a lure for downloading potentially malicious applications or further content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.co/app/431946152/roblox-cute-girl-outfits-free-game-hack
    • https://www.wco.org.uk/uploads/files/files/free-spins-coin-master-2021_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/minecraft-java-edition-download-free_GM479516143.pdf
    • https://www.wco.org.uk/uploads/files/files/coin-master-hacks-no-downloading_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/how-to-get-free-likes-on-tiktok-for-free_GM835599320.pdf
    • https://www.wco.org.uk/uploads/files/files/how-can-you-get-free-robux-2021_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/how-to-get-tiktok-famous-free_GM835599320.pdf
    • https://www.wco.org.uk/uploads/files/files/robux-hack-client-download_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/free-cracked-minecraft-server-hosting_GM479516143.pdf
    • https://www.wco.org.uk/uploads/files/files/blogspot-free-spins-coin-master_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/earn-robux-com_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/today-coin-master-free-coins-link_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/free-coin-master-stuff_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/actual-free-robux_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/roblox-how-to-get-free-clothes_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/how-do-you-get-free-roblox_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/hack-roblox-net-one-handynummer_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/get-coin-master-spins-free_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/will-minecraft-ever-be-free_GM479516143.pdf
    • https://www.wco.org.uk/uploads/files/files/minecraft_GM479516143.pdf
    • https://www.roblox.com/.I
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000322d.bin
53796e23ba30424cdcadab1c5dbe995bca7031bfda0a5b698c1f4edcb5a19aaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x322D 22296 bytes
font_01_sfnt_off000063b3.bin
e1b2c4e2851a70886b211859198268bfb36e3f4f2b73013846c50d57ce7bbbc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x63B3 18828 bytes