Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a36cbf81594ccfc…

MALICIOUS

PDF

41.8 KB Created: 2021-05-24 17:33:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3124dec0423814979c900d9dcc9fecf9 SHA-1: 21415d6bc7adc39dc176c27031f832004db3b1b7 SHA-256: 4a36cbf81594ccfc208d516dcffa784c60b073e0f6d80cefa06d62b002450e16
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8078

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/free-minecraft-java-edition-game-hack PDF link annotation
    • http://library.stembi.ac.id/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3577 24624 bytes
SHA-256: 3b184ad6e5ad69174ca78be20572b66dab00ecbcd1342bfd9ddee60feea60221
font_01_sfnt_off00006d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D43 3084 bytes
SHA-256: eeadcb18adcfe57e07f5655a001ed91230d3e27a0eb02d3d0a65cc7828d94f40
font_02_sfnt_off000077d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D1 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_03_sfnt_off000081e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81E1 18164 bytes
SHA-256: c8dc3c0ccaec2cbfabf4f7c22776233ed86b35e7dce69fc624c99833f95d0764

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