Malicious PDF — malware analysis report

Static analysis result for SHA-256 1895e722863e5431…

MALICIOUS

PDF

41.9 KB Created: 2020-07-08 11:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 2658b1a0972871223ca606f8b3212bee SHA-1: 806ad1ac1d434bf628a8b1c95e38b5abd56c02c7 SHA-256: 1895e722863e543112592ccab8e2d499ae056a25982f1d7d53d2cc3795b63e38
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to external PDF files hosted on numerous disposable domains. One of these links, 'https://ttraff.ru/wb?keyword=underwater%20architecture%20pdf', is identified as a known malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme, potentially distributing malware or leading to phishing sites. No scripts were extracted, but the structure strongly indicates malicious intent.

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.ru/wb?keyword=underwater%20architecture%20pdf In PDF document text
    • http://files.saundersvet.com/uploads/1/3/0/7/130739769/e363f310302dd.pdfIn PDF document text
    • http://files.dlfinancial.org/uploads/1/3/1/3/131379749/tobij.pdfIn PDF document text
    • http://files.cuestacollegerodeo.com/uploads/1/3/1/4/131483550/f518ae417.pdfIn PDF document text
    • http://files.professorwillis.com/uploads/1/3/0/9/130969819/3536095.pdfIn PDF document text
    • http://files.foreignlanguagedepartment.com/uploads/1/3/1/3/131380953/e91e9632b0a86f.pdfIn PDF document text
    • http://files.helenvanstolk.com/uploads/1/3/1/8/131856518/mabubivikoziko.pdfIn PDF document text
    • http://files.thebetterbrasspipe.com/uploads/1/3/2/7/132740218/daf3e1d8396c143.pdfIn PDF document text
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b1b39.pdfIn PDF document text
    • http://files.dylanness.com/uploads/1/3/0/9/130969819/860cb.pdfIn PDF document text
    • http://files.lindathurd.com/uploads/1/3/0/7/130775053/gusisinox.pdfIn PDF document text
    • http://files.biggsbassethounds.com/uploads/1/3/1/8/131857071/84fb7a2093dbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zozijonatoto.files.wordpress.com/2020/06/viwimolobadupigoje.pdfIn PDF document text
    • https://lisovituju.files.wordpress.com/2020/07/12667120195.pdfIn PDF document text
    • https://xudevameta.files.wordpress.com/2020/07/kerujudimix.pdfIn PDF document text
    • https://gugofesid.files.wordpress.com/2020/07/31014994711.pdfIn PDF document text
    • https://jijafozivofi.files.wordpress.com/2020/07/vadijeni.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_off000066ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AC 4888 bytes
SHA-256: 919cbd4c839c17d15c524ea737671f7586cd032ca39f1974155258bec7b1cb94
font_01_sfnt_off00007752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7752 10392 bytes
SHA-256: d9497a08ba9a294c6a6743e6a093a73103327678fa84d3d1ed5e69feba7be9a3

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