Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3de4451cac5296…

MALICIOUS

PDF

35.6 KB Created: 2020-04-07 12:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cc0da969834b24a08631364e801c56ec SHA-1: b9c46aefdbdb13f8bf90b73e1bff3d508cf3f9a6 SHA-256: 6d3de4451cac529654f54c5a67ddd229ddee06cca8431c43a2bbcd776bea7af2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of compromise and suggest a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://absolutepaintingclt.com/uploads/1/3/0/4/130476145/130476145.html#palabras+que+empiecen+con+m+minuscula
    • http://mhs-training.com/uploads/1/3/0/7/130775674/3560218.pdf
    • http://nightcycle.studio/uploads/1/3/0/5/130588230/80992d259f16a.pdf
    • http://wematterinc.com/uploads/1/3/0/5/130551518/rutokidefemamed.pdf
    • http://transformyourwealthandhealth.com/uploads/1/3/0/6/130620940/a31249de41b2.pdf
    • http://rubyandgwen.com/uploads/1/3/1/3/131380651/8444313.pdf
    • http://vancitycounseling.com/uploads/1/3/0/8/130814247/6360320.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063f4.bin
393bf5dc08b82bcc551794aebcdf9781f49a4bfcb73166cc2920f719bb0cce4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F4 7740 bytes

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