Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3aac4e5958a60d…

MALICIOUS

PDF

33.6 KB Created: 2020-04-09 05:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4f846ed1a9e70dc28d294a7da53ae4e SHA-1: 0c312ae3f2bf9c15481ba5b3fae799134206983a SHA-256: 4b3aac4e5958a60d1edf2fd4d91ab1a51ba233fe3be0b972587f96d8e8b66ce2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This pattern is indicative of a link farm or redirection scheme designed to obscure the ultimate destination or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. The presence of numerous SEO-optimized PDF links suggests an attempt to leverage search engine visibility for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ohsaycanyoucbd.com/uploads/1/3/0/2/130288811/130288811.html#nutrition+subway+italian+bread
    • http://israfelart.com/uploads/1/3/0/6/130604321/miwekomoxifigo.pdf
    • http://chasevelez.com/uploads/1/3/0/8/130813768/7704b.pdf
    • http://handi-tech.com/uploads/1/3/0/7/130739269/b5de02b68dec.pdf
    • http://uniquelylv.com/uploads/1/3/0/6/130639037/446158.pdf
    • http://empoweredbysam.com/uploads/1/3/0/7/130738824/78bc8ce6fb4.pdf
    • http://whyartthy.com/uploads/1/3/1/3/131384611/milumejerepuganik.pdf
    • http://escwire.com/uploads/1/3/0/6/130621983/23bd0a3c74a93.pdf
    • http://gastineaurealty.com/uploads/1/3/0/7/130775144/numef.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_off00005c9d.bin
ea295c377f4db3f6b17b40cf0eb253be42faf71540419bdebf3b0540caf0f084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9D 7460 bytes

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