Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c29936c96ddd0aa…

MALICIOUS

PDF

46.1 KB Created: 2021-06-09 03:41:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ba1dd03e806d87292bc18e29b20a8345 SHA-1: d7ea48e33434f598d85d0acd9906e83a347ad345 SHA-256: 8c29936c96ddd0aa09e7a3d2e67d03fef594115de01e7e7748207b7e0ba9e552
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link to known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to 'free exploits for Roblox games'. The ML classifier also flagged this PDF as malicious with high confidence. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to a harmful site, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.tw/app/431946152/free-exploit-for-roblox-that-works-on-fe In PDF document text
    • http://cdescolapios.org/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://cdescolapios.org/images/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://cdescolapios.org/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://cdescolapios.org/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://cdescolapios.org/images/how-to-get-free-robux-glitch-with-only-inspect_GM431946152.pdfIn PDF document text
    • http://cdescolapios.org/images/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://cdescolapios.org/images/haktuts-free-spins_GM406889139.pdfIn PDF document text
    • http://cdescolapios.org/images/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://cdescolapios.org/images/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://cdescolapios.org/images/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://cdescolapios.org/images/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://cdescolapios.org/images/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://cdescolapios.org/images/get-robux-now_GM431946152.pdfIn PDF document text
    • http://cdescolapios.org/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://cdescolapios.org/images/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://cdescolapios.org/images/free-unused-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://cdescolapios.org/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://cdescolapios.org/images/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cdescolapios.org/images/make-free-robux_GM431946152.pdfIn PDF document text
    • http://cdescolapios.org/images/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5201 26424 bytes
SHA-256: e11c8f745b295df7cde9d5cf8aea16f6c330fda676bc3a98a83afaee0ea3986d
font_01_sfnt_off00008ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDB 19608 bytes
SHA-256: fc93dfb4c8296531ca0754f8d5baa8d5be990e0fdcc79c378454f0bb7cd3ba2a

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