Malicious PDF — malware analysis report

Static analysis result for SHA-256 3add6a1dfe93bee3…

MALICIOUS

PDF

40.6 KB Created: 2020-03-10 12:01:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2151d909cfaa1aaf8f5b37438471260f SHA-1: 6a6974c6f4fff0a634ba2d3d99e6f0a5a668c803 SHA-256: 3add6a1dfe93bee38ff072ee5a13b082817513a7bc18229bf82f5996998168b8
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to 'Math facts 0-20 worksheets' and the authoring application 'wkhtmltopdf', suggesting a lure document. The primary attack pattern involves redirecting the user to a link farm, likely to distribute further malware or engage in SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://vn55.brdge.org/uploads/1/3/0/6/130620556/130620556.html#math+facts+0-20+worksheets
    • http://barenaturebeauty.com.au/uploads/1/3/0/4/130435763/ff934c108cbea3.pdf
    • http://thathappyplace.net/uploads/1/3/0/2/130289649/8310159.pdf
    • http://camelothomesllc.com/uploads/1/3/0/7/130740244/sagekezu-suzubak-zirapofesezefi-roritoxetu.pdf
    • http://primaris.net/uploads/1/3/0/6/130605030/bc560bc6fa4ae.pdf
    • http://pitheater.com/uploads/1/3/0/4/130483986/bavedigoxilabar.pdf
    • http://root.diamondcb.com/uploads/1/3/0/7/130740547/e98ff0.pdf
    • http://illumina.implementation.collectivehealth.com/uploads/1/3/0/6/130639139/5960797.pdf
    • http://casahabana56.com/uploads/1/3/0/4/130483634/sezif.pdf
    • http://glasspictureproductions.com/uploads/1/3/0/6/130620609/semik-konikunusof.pdf
    • http://nkshoporlando.com/uploads/1/3/0/2/130274281/6083937.pdf
    • http://nicole-pellegrino.com/uploads/1/3/0/4/130483963/sizatax_gurobuzux.pdf
    • http://posureinnovations.com/uploads/1/3/0/4/130476396/101778.pdf
    • http://chalkmassage.com/uploads/1/3/0/9/130969631/fubed.pdf
    • http://amor-mundi.org/uploads/1/3/0/7/130775245/9563211.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_off000074b6.bin
cde12f5334b7fb65e9662c48c27d92a2980ff951a8bb8d44db39ed41d0c7c27c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B6 8100 bytes

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