Malicious PDF — malware analysis report

Static analysis result for SHA-256 b824f47c259d11fb…

MALICIOUS

PDF

36.6 KB Created: 2021-06-30 13:50:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c7c1464740095c83be862bd1b7e2d91b SHA-1: b72992e715eed3a4141534e084d49d9970b70eb8 SHA-256: b824f47c259d11fb183d1145b43db34bc4e666d7f1961017acdd17403bc7a651
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs promising free in-game currency or cheats for popular games like Roblox and Coin Master. The ML classifier strongly indicates maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The primary goal appears to be directing users to download potentially harmful files or visit malicious sites.

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-pet-sim-free-vip-server-game-hack
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-no-bc_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-generator-2021-no-human-verification_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-roblox-pikachu-accessories-2021_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/link-coin-master_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-twitter-free-spins_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/wurst-115-2_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-hack-any-account-on-roblox-2021_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-spins-coin-master-links-no-human-verification_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/hack-coin-master-online_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/roblox-decal-for-free_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-can-i-get-free-coinsn-coin-master_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/minecraft-java-edition-download-free_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-links-free-spins_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/hack-version-of-coin-master-apk-download_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-ios_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/vehicle-stereo-free-roblox_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-come_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/new-roblox-hack-exploit-for-murder-mystery-2_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-free-daily-spins-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000036db.bin
677b589ee897933eb7fe173d8c4bee065ed5fe6a0b8b8dd4aebb9f750b92275a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x36DB 22432 bytes
font_01_sfnt_off00006870.bin
b746079394d45b322ce5576d92d8eaab3d35b1d0a6290588d162da07f931db1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6870 19712 bytes

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