Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5b1fa565c637f8…

MALICIOUS

PDF

45.1 KB Created: 2021-05-19 18:33:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d491f86187f76da63d342522a72d5580 SHA-1: e36dbc85288cad7fc372fd5d56304ab60e031260 SHA-256: 4a5b1fa565c637f8ac9adfc0ce1a879f647f567c871eea44f13ce9a4ac85b819
102 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to SEO-optimized PDF files hosted on bazilikum.com, and one directly to netcdn.xyz. These links are designed to lure users into clicking them by promising free in-game currency or hacks for popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/coin-master-spin-and-coins-free-game-hack
    • https://bazilikum.com/images/coin-master-hack-2021-free_GM406889139.pdf
    • https://bazilikum.com/images/coin-monster_GM406889139.pdf
    • https://bazilikum.com/images/free-robux-today_GM431946152.pdf
    • https://bazilikum.com/images/how-do-we-get-free-robux_GM431946152.pdf
    • https://bazilikum.com/images/free-robux-no-verification-required_GM431946152.pdf
    • https://bazilikum.com/images/coin-master-free-coins-link-march-2021_GM406889139.pdf
    • https://bazilikum.com/images/coin-master-unlimited-spins-hack_GM406889139.pdf
    • https://bazilikum.com/images/how-to-make-free-robux_GM431946152.pdf
    • https://bazilikum.com/images/coin-master-app-free-download_GM406889139.pdf
    • https://bazilikum.com/images/hacks-for-coin-master-game_GM406889139.pdf
    • https://bazilikum.com/images/minecraft-free-android_GM479516143.pdf
    • https://bazilikum.com/images/need-free-spins-for-coin-master_GM406889139.pdf
    • https://bazilikum.com/images/coin-master-332-apk-free-download_GM406889139.pdf
    • https://bazilikum.com/images/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • https://bazilikum.com/images/free-robux-discord-servers_GM431946152.pdf
    • https://bazilikum.com/images/coin-master-villages_GM406889139.pdf
    • https://bazilikum.com/images/coin-master-daily-spin-free_GM406889139.pdf
    • https://bazilikum.com/images/free-links-for-coin-master_GM406889139.pdf
    • https://bazilikum.com/images/how-to-get-free-robux-on-computer_GM431946152.pdf
    • https://bazilikum.com/images/coin-master-unlimited-spin-hack-apk_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004853.bin
59857ecdee8be41e4304e61d0e8e0d9567fb22591b0c8971df33c596dc9be39b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4853 26692 bytes
font_01_sfnt_off000084c2.bin
fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f
pdf-font-stream PDF embedded font (sfnt) at offset 0x84C2 2812 bytes
font_02_sfnt_off00008e63.bin
aba7dcfd42a0f74c9e892866c2c78c20b6cae4d7af540321f27c32cc6aee9396
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E63 18060 bytes