Malicious PDF — malware analysis report

Static analysis result for SHA-256 261140b1f52901e4…

MALICIOUS

PDF

35.3 KB Created: 2020-10-30 03:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4bcd8bf7648ea64abdae1ce82a2844a0 SHA-1: ecfd032fff9953b3893a9a00b1329ca7529f0681 SHA-256: 261140b1f52901e484418dec8bc88336e7f4be7706b8d90c25e98ccabf9feeb6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to manipulate search engine results. One of the embedded URLs, 'https://ttraff.club/123?keyword=unit+circle+quiz+answers', is known to lead to malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness.

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.club/123?keyword=unit+circle+quiz+answers In PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/e7e3064f53d.pdfIn PDF document text
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/3791286.pdfIn PDF document text
    • https://sodumixiseto.weebly.com/uploads/1/3/4/3/134311801/xebemirageru-rarefipotur-dadoxelapukipa-mofudu.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/nuxosiw_kifizedawate_ladarefun.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/paniwopuzaw.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/sofivutijomivar.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/3072946.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/gepaneluposonu.pdfIn PDF document text
    • https://gigijegijozi.weebly.com/uploads/1/3/4/4/134400985/faroz.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/e6a81a8.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/cf9c86b0da17b0.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/8472455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/retisovojor/conditions_for_american_soldiers_in_vietnam_war.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af2c14a-ce7d-4adc-b696-78343ec06fa6/84839883589.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_off00004862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4862 5052 bytes
SHA-256: 54f465f670bf0e0ae1842c364e03cd56a77786a8ddb412b18c47746e266e250f
font_01_sfnt_off000059be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59BE 11492 bytes
SHA-256: d043b656902c51726c6eea675e524e72f0a7b3e272a5e722b8d50848b6b27c83

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