Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef38eb1601377a0a…

MALICIOUS

PDF

39.6 KB Created: 2021-05-12 12:04:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ee5931860e63a75ee938c140de9190b3 SHA-1: 2eb2e9402749bc6c29e459ce0171a491627b6e87 SHA-256: ef38eb1601377a0ab28ab6bf6e85d048a1c5fddf28f35cefc7dd135025765f3c
70 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link disguised as a download button, which redirects to a known malicious URL. The document body text and embedded artifacts suggest a lure for free Robux, a common tactic in phishing and scam campaigns. No scripts were extracted, but the presence of a malicious redirector indicates an attempt to deliver a secondary payload or lead the user to a fraudulent site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/huskybucks.com-free-robux-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000030dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30DC 27104 bytes
SHA-256: 1b0778cbb11133fc9796ca685915adf497e14973a0a7f5dd1f151b42d48e6ec5
font_01_sfnt_off00006e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E62 2828 bytes
SHA-256: db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6
font_02_sfnt_off00007819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7819 18688 bytes
SHA-256: 6988f73f4b0746331af176c61d8a6d12afd54d9d4021c1ba8a7576897a1c52a2

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