Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1bcf0a11f60261…

MALICIOUS

PDF

31.2 KB Created: 2020-04-09 13:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c4a1c528180c70b220c7d78711632630 SHA-1: e988251cf9053cd633612de10105f69c888486bb SHA-256: bc1bcf0a11f602612fc3b6139bb60c22d7abe9dcbbaa69f4294002075cb47594
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are structured as SEO spam, pointing to various domains. The document body contains a product name and references to the authoring application, suggesting a lure to attract users searching for specific items. The ML classifier strongly indicates maliciousness, and the presence of numerous unknown URLs supports the conclusion that this document is part of a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://abahousecalls.com/uploads/1/3/0/6/130620845/130620845.html#hamilton+beach+crock+pot+lid+33162h
    • http://artbybrycen.com/uploads/1/3/0/9/130969011/forav.pdf
    • http://haganresources.com/uploads/1/3/0/5/130551391/6febdc2.pdf
    • http://alpharettapestpros.com/uploads/1/3/0/4/130436252/a4ebd4f5c7974a.pdf
    • http://joyinthevalleyministries.com/uploads/1/3/0/7/130738730/pipovonusazapasux.pdf
    • http://electronauticadelta.com/uploads/1/3/0/2/130291975/dagaxidevasulofinipi.pdf
    • http://fikachennai.com/uploads/1/3/0/8/130873875/madusatesinir-senogaso.pdf
    • http://bud.market/uploads/1/3/1/4/131453808/8751535.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_off00005112.bin
e52c26e854a7ad5ceb9f5106b565d2267542af26043d54102d557c0c1ef14706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5112 8164 bytes

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