Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aa251443026e1a…

MALICIOUS

PDF

37.0 KB Created: 2020-07-08 12:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 66ecfd35ed5c96b9f01859406d888288 SHA-1: 49c3f879ea1c99cbe31203e2f312f74ee32244dc SHA-256: 23aa251443026e1ae4c0e48808b93c2cb1e9be35ea731a333a9bb159d3c3ea62
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body is heavily obfuscated but contains references to the same URLs. The primary purpose appears to be SEO manipulation or distributing malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://ttraff.cc/wb?keyword=the%20speckled%20band%20questions%20pdf In PDF document text
    • http://files.lincolnfencecontractors.com/uploads/1/3/2/6/132681938/7c5f525598fb.pdfIn PDF document text
    • http://files.mskhor.com/uploads/1/3/2/6/132682570/fewogedawox-xabuguj-dajelenudunexo.pdfIn PDF document text
    • http://files.learnguitar4fun.com/uploads/1/3/1/8/131856381/8522082.pdfIn PDF document text
    • http://files.valleyliberator.com/uploads/1/3/1/6/131606035/padavosagog.pdfIn PDF document text
    • http://files.livinggodsmission.com/uploads/1/3/0/8/130874413/femobupowufebekoluta.pdfIn PDF document text
    • http://files.thedinopark.com/uploads/1/3/2/7/132740415/6535022.pdfIn PDF document text
    • http://files.ejacts.com/uploads/1/3/1/3/131384018/givebivusunilujogoj.pdfIn PDF document text
    • http://files.istudentsduke.org/uploads/1/3/1/0/131070379/5a5bb0284ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dukidowa.files.wordpress.com/2020/06/parakux.pdfIn PDF document text
    • https://pabozopa.files.wordpress.com/2020/07/subulebejimoba.pdfIn PDF document text
    • https://xarinigeted.files.wordpress.com/2020/07/27925692184.pdfIn PDF document text
    • https://tedinunimo.files.wordpress.com/2020/06/41837940201.pdfIn PDF document text
    • https://julaxotetelu73207895.files.wordpress.com/2020/06/dulujalawutejalef.pdfIn PDF document text
    • https://ponadewez618744445.files.wordpress.com/2020/06/kajuwamuri.pdfIn PDF document text
    • https://vajelasidoxo.files.wordpress.com/2020/07/fusizuginanikutuzovumadi.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 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5397 5308 bytes
SHA-256: 1e6677a11275d5a1f8e36fd1d8dedc267e8f549da81852a0a7310b5b798c2e72
font_01_sfnt_off00006592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6592 9900 bytes
SHA-256: 03dfd6f3cf718e4780617ed8735901c651b3437691b97460e6a16815aac39467

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