Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7884a35640494d…

MALICIOUS

PDF

30.2 KB Created: 2020-05-14 16:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 81d3cdc09343bfc6c1820b9b1c708970 SHA-1: 38e43eca0cb13e7267c941ec2e2d6c4871382a93 SHA-256: ff7884a35640494d00da0eb9f87482476a8c3bbc5bf19924de353e6a4a2af94d
96 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 numerically or generically named and hosted on unrelated domains, indicating a link farm or SEO manipulation tactic. The document body contains a lure related to 'free subtitles' and the file was generated by wkhtmltopdf, suggesting it was programmatically created to host these links. No scripts were extracted, and the primary malicious activity appears to be directing users to a network of potentially malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bee-observatory.com/uploads/1/3/0/2/130289458/130289458.html#below+her+mouth+subtitles+free PDF link annotation
    • http://sgreptilesandaquatics.com/uploads/1/3/1/4/131409508/4834727.pdfIn PDF document text
    • http://setamortgage.com/uploads/1/3/0/5/130539255/1839eafba237.pdfIn PDF document text
    • http://orthodontic-continuing-education.com/uploads/1/3/1/3/131398064/bidulazejuri-xamizu.pdfIn PDF document text
    • http://978weddings.com/uploads/1/3/0/6/130604018/cc264d.pdfIn PDF document text
    • http://thomascignomd.com/uploads/1/3/1/8/131871685/7576755.pdfIn PDF document text
    • http://dreamlinestudios.org/uploads/1/3/0/5/130550928/narukikokijize-sojegurex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE1 10276 bytes
SHA-256: 83eba773168c872286b2cf3747ad25712eef54c13b8b68d193871d45aa080ca7

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