Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f53456ffd994a0b…

MALICIOUS

PDF

41.3 KB Created: 2020-03-21 12:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 21b186959fb11a8826a8dc3fced096f7 SHA-1: 57c8386d1c328967d6827af734d19f165594d72d SHA-256: 1f53456ffd994a0bc4a4f355ab48798e118ecde00be4b7498c05d50c40b0dfab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF file exhibits characteristics of a link farm, with numerous external links pointing to other PDF files hosted on various domains. The ML classifier strongly indicated maliciousness. The document body contains a mix of obfuscated text and URLs, suggesting an attempt to disguise the malicious intent. The primary attack pattern involves directing users to a network of SEO-optimized PDF documents, likely for malicious redirection or content delivery.

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://designproinnovation.com/uploads/1/3/0/6/130639653/130639653.html#como+se+llaman+las+palabras+con+10+silabas
    • http://jarredventer.com/uploads/1/3/0/5/130547552/3c51f4.pdf
    • http://campwinema.org/uploads/1/3/0/6/130639059/nukuzevebino_fepurodivare_xomonelefub.pdf
    • http://www.peacefilledhome.com/uploads/1/3/0/5/130551064/jikumit-lawekefofeme-sinataje.pdf
    • http://hanopedals.com/uploads/1/3/0/7/130776113/gijovilake.pdf
    • http://equitytradinglabs.org/uploads/1/3/0/4/130436180/a0182f29de3.pdf
    • http://redneckfest.org/uploads/1/3/0/3/130313564/mofikag.pdf
    • http://rachaelmaephotography.com/uploads/1/3/0/4/130483499/1907852.pdf
    • http://raincarrying.com/uploads/1/3/0/5/130589413/c1690.pdf
    • http://www.maimanistation.com/uploads/1/3/0/7/130740045/8e2775c.pdf
    • http://unicornwriting.com/uploads/1/3/0/7/130738970/dinebuku_dajelu_pobunovi.pdf
    • http://www.makeasavvybusinessdecision.com/uploads/1/3/0/8/130874038/d7f98cf570fce49.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_off00007859.bin
5af87db592479c4205e2ff22b92b37ca1dbccec62c2fddd3433312ba199a2242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7859 8400 bytes

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