Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e2c92c5a4f30ff…

MALICIOUS

PDF

48.6 KB Created: 2021-06-11 00:36:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8e1ed12497ac1b0dd190dce6a2045f41 SHA-1: 31054a9760e78eae1e30cda9ae4aa73f0aa503fa SHA-256: 55e2c92c5a4f30ffbb1d888399865e3e74da8d10cdffc0a0f484696f1d1bc251
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically designed to lure users with promises of free Robux. The ML classifier also flagged this PDF as malicious. The presence of a visual download button further supports the lure-based attack pattern. The embedded URLs likely lead to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-robux-youtube.com-game-hack In PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/robux-earning-sites_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/robloxcom-free-kkk_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-tiktok-views_GM835599320.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-coin-app_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/roblox-cheats-november-2021-dll_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-bonus_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/best-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://upes.edu.sv/ckfinder/userfiles/files/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005046.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5046 26220 bytes
SHA-256: 3db8a645eeae7f457c4e8eb0aa1a21c132be29a96a0774311329733244e5fee8
font_01_sfnt_off00008d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6F 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A81 18604 bytes
SHA-256: 352a8389c09602cbe65d8dc7be4ca10cf3534651eb4d444d77254c68a509d006

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