Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf03877ba66a7e67…

MALICIOUS

PDF

36.3 KB Created: 2021-05-10 10:26:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3f2b49e3f85fd1212578ab21e5181a1e SHA-1: 991c72a406e065949d7f189c4dde952014918562 SHA-256: bf03877ba66a7e67c28ca14f7f0f2e6e401b89a0a56c1a225d25942bc1300fa7
70 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://netcdn.xyz/app/431946152/cpbild.co-robux-game-hack'. The document body also contains text related to 'Robux' and a call to action to 'CLICK HERE TO ACCESS ROBLOX GENERATOR', indicating a scam or lure. The PDF's authoring application, wkhtmltopdf, is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier clean score 0.0284

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/cpbild.co-robux-game-hack In 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_003_off000033f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F9 24688 bytes
SHA-256: 07bde03787c4ed6202fd7acd24f09936e84a4e469d52743d703a0005f9e05dd9
font_01_sfnt_off00006bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDB 18460 bytes
SHA-256: 99048da186b71c9dfc5fc272bc085340ca0662c1721045875ee4c725f3f8eda0

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