Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4f0d3d66ae156d…

MALICIOUS

PDF

80.3 KB Created: 2020-10-17 13:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2ee4d1af744a2eb1d8fac7ad5c42ff73 SHA-1: aae39f21889e6eaf96ad5f27afac66ac54ca5a0e SHA-256: 3a4f0d3d66ae156ddbe38dc8c8de2475e06294574e39f62871d049f79e91172c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector services, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at `https://gettraff.ru/wb?keyword=don%20quijote%20dela%20mancha%20vicens%20vives%20gratis`. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous external links suggests an attempt to drive traffic to malicious sites.

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://gettraff.ru/wb?keyword=don%20quijote%20dela%20mancha%20vicens%20vives%20gratis In PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/tofaropadirejo.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/xepizujapodi.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/kovojoxokisima.pdfIn PDF document text
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/0c7de.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/vutuvijuvopevizife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_5f8a2ab804d33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f872bcbe573c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f872b053828f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d40fcba-1c68-4bdf-9515-075939147909/poxadedobolotire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a421d3-4782-4841-8060-099db6c6720c/lifefitness_5500_hr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08f21b9-502e-405b-9416-cf9378582e8e/malanon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb3afa33-7a07-4e03-8246-79ddbfa2e0ca/vukazuxusopajozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193c6544-fb2f-43b2-a372-ab73038ce605/68017438720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387e3323-7e2d-4660-8f5e-8a9db549fd8f/84144034211.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9383/5432/files/zokum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2924/9179/files/xd_series_rockstar_rims.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 5616 bytes
SHA-256: 0887d89eced9bc8d3a425d35d2fb2d00160f55ce1bc1564eda2daaae4ff2b54f
font_01_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 18728 bytes
SHA-256: a04a483a23d1fafad2da5122b945f804cb35b070381bb2967c717b988b0b0c91

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