Malicious PDF — malware analysis report

Static analysis result for SHA-256 57018dbd557eaa7c…

MALICIOUS

PDF

47.7 KB Created: 2021-05-15 01:04:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ea71de1d2b9a480f71433c91f155e0c1 SHA-1: 3deb8bd9f8f22c40d0c16af760160f62c80ec649 SHA-256: 57018dbd557eaa7c3688243f7580720a22d854fc5a841b5424ca0dba5f37cb51
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading files. The primary URL identified is associated with 'free coins' and 'game hack', indicating a lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.xyz/app/406889139/free-coins-coin-master-2021-game-hack
    • https://verdensbarn.no/images/minecraft-windows-10-edition-free-download_GM479516143.pdf
    • https://verdensbarn.no/images/free-robux-without-verify_GM431946152.pdf
    • https://verdensbarn.no/images/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • https://verdensbarn.no/images/coin-master-free-account_GM406889139.pdf
    • https://verdensbarn.no/images/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • https://verdensbarn.no/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://verdensbarn.no/images/how-to-get-free-premium-roblox_GM431946152.pdf
    • https://verdensbarn.no/images/how-to-get-free-robux-2021_GM431946152.pdf
    • https://verdensbarn.no/images/coin-master-20-free-spins-link-2021_GM406889139.pdf
    • https://verdensbarn.no/images/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdf
    • https://verdensbarn.no/images/free-minecraft-hosting_GM479516143.pdf
    • https://verdensbarn.no/images/earn-roblox_GM431946152.pdf
    • https://verdensbarn.no/images/free-robux-place_GM431946152.pdf
    • https://verdensbarn.no/images/how-to-get-free-shirts-on-roblox_GM431946152.pdf
    • https://verdensbarn.no/images/roblox-hack-unlimited-robux_GM431946152.pdf
    • https://verdensbarn.no/images/free-robux-accounts_GM431946152.pdf
    • https://verdensbarn.no/images/apps-to-get-free-robux_GM431946152.pdf
    • https://verdensbarn.no/images/free-roblox-premium_GM431946152.pdf
    • https://verdensbarn.no/images/free-spin-link-of-coin-master_GM406889139.pdf
    • https://verdensbarn.no/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cd6.bin
df54cbb40a9365129b8dd1fd54b5c25291e51c297a5c72fa20069231340a5910
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CD6 25004 bytes
font_01_sfnt_off00008645.bin
d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8645 7332 bytes
font_02_sfnt_off0000985d.bin
0727bd4027d3f5eec951b181c2bc31ee4d98e10eed2c862aff41d240a04f60ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x985D 18112 bytes