Malicious PDF — malware analysis report

Static analysis result for SHA-256 be20503ca38c0d87…

MALICIOUS

PDF

41.7 KB Created: 2021-05-16 18:01:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b619c29d03cacbd5d72839c55fd22c09 SHA-1: 24538b01c21f1bb63bb111f2df5ed0a8a6ac8a08 SHA-256: be20503ca38c0d87521d57e07bbd602b4bcc5cd1a03dd51b4e592127949392a9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are structured as SEO link farm content related to game hacks and free currency. The ML classifier also flagged this PDF as malicious with high confidence. The presence of numerous links to potentially malicious domains suggests a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-coin-and-spin-for-coin-master-game-hack
    • http://1a-vermietung.com/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • http://1a-vermietung.com/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • http://1a-vermietung.com/images/hack-xp-net-generators-coin-master_GM406889139.pdf
    • http://1a-vermietung.com/images/free-robux-com_GM431946152.pdf
    • http://1a-vermietung.com/images/how-to-get-free-robux-fast_GM431946152.pdf
    • http://1a-vermietung.com/images/coin-master-hack-apk-latest-version-2021_GM406889139.pdf
    • http://1a-vermietung.com/images/coin-master-hack-version-33-2_GM406889139.pdf
    • http://1a-vermietung.com/images/spin-links-for-coin-master_GM406889139.pdf
    • http://1a-vermietung.com/images/can-you-hack-coin-master_GM406889139.pdf
    • http://1a-vermietung.com/images/free-roblox-accounts-with-robux_GM431946152.pdf
    • http://1a-vermietung.com/images/free-unlimited-robux_GM431946152.pdf
    • http://1a-vermietung.com/images/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdf
    • http://1a-vermietung.com/images/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • http://1a-vermietung.com/images/is-free-robux-real_GM431946152.pdf
    • http://1a-vermietung.com/images/best-free-minecraft-hacked-client_GM479516143.pdf
    • http://1a-vermietung.com/images/can-u-get-free-robux_GM431946152.pdf
    • http://1a-vermietung.com/images/coin-master-free-spins-hack_GM406889139.pdf
    • http://1a-vermietung.com/images/earn-free-robux-for-roblox_GM431946152.pdf
    • http://1a-vermietung.com/images/get-free-robux-generator_GM431946152.pdf
    • http://1a-vermietung.com/images/how-to-get-more-robux-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a52.bin
0aded537f69b1c77a876052056fbb2eca383cc30be1ea952fb977439b1e1357a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A52 24124 bytes
font_01_sfnt_off00008144.bin
42d2e7759bfcfecd447a46542d8809f4e944f7c9df23d0847fbb4c7837fae2b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8144 18060 bytes