Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c60886ae2112c3…

MALICIOUS

PDF

113.7 KB Created: 2020-06-04 01:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 9dbaf073e4f889335257f91a0833bb9a SHA-1: 3bf11e4c4a6980379bba6eaea2d64f757454adc8 SHA-256: c0c60886ae2112c342b2f39970db9a3b817d01ddcd5a4f0799294e01d9d4785a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a deceptive title related to therapeutic exercise, but its primary function appears to be a link farm. It embeds numerous external URLs pointing to other PDF files, a common tactic for SEO manipulation or distributing malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded links.

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://crabbymama.com/uploads/1/3/1/3/131384402/131384402.html#therapeutic+exercise+foundations+and+techniques PDF link annotation
    • http://seridianconstruction.davidmichaeldesigns.com/uploads/1/3/1/1/131163898/a1f117.pdfIn PDF document text
    • http://abbookdesign.com/uploads/1/3/0/6/130604780/4d5a08b313.pdfIn PDF document text
    • http://thebrennermans.com/uploads/1/3/0/8/130813055/reletekugodunij.pdfIn PDF document text
    • http://aalohakamaainaconcretellc.com/uploads/1/3/0/8/130873830/bf04b.pdfIn PDF document text
    • http://hostmaster.honeyscider.co.uk/uploads/1/3/0/8/130873955/2821001.pdfIn PDF document text
    • http://cpanel.slowburnmarketing.com/uploads/1/3/0/4/130477028/tatidevoxuraxazosit.pdfIn PDF document text
    • http://kateyscakes.com/uploads/1/3/0/2/130289198/469faf.pdfIn PDF document text
    • http://hazelwise.com/uploads/1/3/0/6/130639780/2517824.pdfIn PDF document text
    • http://74-123-77-122.mgwnet.com/uploads/1/3/1/3/131384227/532161.pdfIn PDF document text
    • http://tinyspaces.de/uploads/1/3/0/9/130969056/4881306.pdfIn PDF document text
    • http://3boyspaintingparties.com/uploads/1/3/1/3/131379380/ranatumujurebibe.pdfIn PDF document text
    • http://crabbymama.com/uploads/1/3/1/3/131384402/terms.htmlIn PDF document text
    • http://crabbymama.com/uploads/1/3/1/3/131384402/dmca.htmlIn PDF document text
    • http://crabbymama.com/uploads/1/3/1/3/131384402/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rufumeridap.files.wordpress.com/2020/06/70850146149.pdfIn PDF document text
    • https://bikewanipid755441552.files.wordpress.com/2020/06/48946906465.pdfIn PDF document text
    • https://pabaxonada.files.wordpress.com/2020/06/96251055637.pdfIn 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 1

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_off000191be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191BE 11972 bytes
SHA-256: 46c913b6590bf67b7349039b4b27b11a4e9e0bb0edd771ccdc23ec98bdf73e60

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