Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ba41cdeef51a6a…

MALICIOUS

PDF

38.4 KB Created: 2021-05-21 20:12:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 269656f311b4468aed7fecae5cf5504a SHA-1: b1aff9fad19b4920f79c16df787d1b6164ee7ac5 SHA-256: 88ba41cdeef51a6aafba479d5e7fe37009a4fec2d1dd114607ae59eb8c972622
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links and text promoting 'free Robux' and a 'Roblox Generator', which is a common lure for scams. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the primary link leads to known malicious infrastructure. While no scripts were explicitly extracted, the nature of the lure and the malicious redirector strongly suggest an attempt to lead the user to a malicious website for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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.xyz/app/431946152/uprobux.com-free-robux-game-hack In PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/tiktok-free-view-iphone-theme_GM835599320.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-link_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
stream_002_off00003416.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3416 26860 bytes
SHA-256: ac34424412cb0038d8e14d4254cbed19d7c9ff14128f0f817e903197c204b3ec
font_01_sfnt_off000073ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73AC 18700 bytes
SHA-256: 143ab518bfe1873128e001b27a68cdab9711d8d723564be581f3f50f35f3a2b6

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