Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e55164c624f970…

MALICIOUS

PDF

45.1 KB Created: 2020-11-08 06:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5a56f36aed80f818d01742bbc7927339 SHA-1: 007b0f3521c5906272c9e10279ca63f58af6a664 SHA-256: 65e55164c624f970c0c910451628e971295b212de4b893aaafcdb6dd1364449d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many hosted on disposable domains, forming a link farm. One prominent URL, 'https://trafffe.ru/123?keyword=tesla+stock+price+aftermarket', suggests a lure related to financial news. The ML classifier strongly indicated maliciousness, and the structure points towards SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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 https://trafffe.ru/123?keyword=tesla+stock+price+aftermarket PDF link annotation
    • https://zotadipijipas.weebly.com/uploads/1/3/4/4/134467791/gaxidawudosorewudat.pdfIn PDF document text
    • https://kefanizitadibuz.weebly.com/uploads/1/3/4/3/134328212/kituwuviwelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5f97d8bd13304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f88ca1fdd4f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_5f9c6b06150f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5f9df909aabff.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/4a89ecc5-9695-4251-ba9a-552a59c341ab/61742916551.pdfIn PDF document text
    • https://zelowixosig.files.wordpress.com/2020/11/litovofufererobulodurotib.pdfIn PDF document text
    • https://gogajajar.files.wordpress.com/2020/11/48539197016.pdfIn PDF document text
    • https://tifudegusup.files.wordpress.com/2020/11/nesis.pdfIn PDF document text
    • https://jasobegofur.files.wordpress.com/2020/11/59081267319.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_off00007062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7062 5172 bytes
SHA-256: 7227325558bca2ef27c1ef2ce8770b0e04f81ff590f7ecbc731aa938b022f2cc
font_01_sfnt_off000081e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81E9 11292 bytes
SHA-256: 15c3e01bf66b167a5d8d9af818c54d2179933cbb41971426f2b7a8d64a145bb5

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