Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50a3a86c337c049…

MALICIOUS

PDF

42.0 KB Created: 2021-05-12 16:11:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 21f4448a4d1c8a9184e19b1855be3e5b SHA-1: bc339667fffce1f8f330d0979e10bb73301de860 SHA-256: d50a3a86c337c04995895fddbbf54bafe93e86f44de7675b5ad4e22fea60abc5
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are designed to appear as free game cheats or currency. The heuristic PDF_SEO_LINK_FARM indicates a large number of these links, suggesting a link farm designed to host malicious content. The ML_NYX_PDF_MALICIOUS model also flagged this PDF with high confidence. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

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/479516143/minecraft-java-free-game-hack
    • http://pustaka.polbangtan-gowa.ac.id/repository/google-moon-active_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/hack-coin-master-apk-download_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/free-robux-no-generator_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/free-robux-generator-no-survey_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-free-spin-2912-2021_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/easy-ways-to-get-free-robux_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/how-to-get-free-robux-in-2021_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/minecraft-java-edition-free-download-for-android_GM479516143.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/how-to-hack-m-coins-mcpe-master_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-heaven-free-spins-link_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-hack-no-verification-no-signup_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/how-to-get-2021-robux-for-free_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/free-robux-codes-2021_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b47.bin
f0437ae56e318e77bf48d056a5f03d2ef8eea1d36606a001f6b9a89fc26c7b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B47 24976 bytes
font_01_sfnt_off0000831b.bin
c651dee67b00b36100d0c208f30a7974f38e9c4fefacd489da3c8fda34869f62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x831B 17848 bytes

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