Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7023c4802de6d9a…

MALICIOUS

PDF

42.5 KB Created: 2020-11-05 06:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c7b8954c460131b0f4adcaf327cc8102 SHA-1: b951f8c46a2c912954e66ef1bdd7d8b4da30d2c3 SHA-256: f7023c4802de6d9ae388d1f9789144ab5a12101e89171b76a5d2a63ca01df676
154 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 pointing to external PDFs, designed to create a link farm for SEO purposes. One of the primary links, 'https://ttraff.ru/123?keyword=unblocked+games+pacxon', is flagged as a malicious redirector. The document's structure and link farm behavior suggest an attempt to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/123?keyword=unblocked+games+pacxon In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f8eadd7464b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5f9114f1d9233.pdfIn PDF document text
    • https://virukuzababije.weebly.com/uploads/1/3/4/3/134350100/xaperejafikapura.pdfIn PDF document text
    • https://tamegafatukof.weebly.com/uploads/1/3/4/4/134400059/2731935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_5f8ab669d5bc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_5f9e3921a6d5a.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/0e5e78cc-b817-487d-9cab-a8c406997418/rufodiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74678249-3aee-4cb6-ad56-2ee7f5c01406/four_4s_math_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/22515847790.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/netflix_series_movies_to_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb2cea8-a1e4-47ba-9b22-f80a06a10aef/59738782700.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/zuxise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf48045-0d58-42d8-b5ae-9bb051018062/95392679180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/041a544d-a878-4233-b5f3-db6fdd61276a/63136326487.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_off00006560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6560 5560 bytes
SHA-256: ce94189183cc5a0130419edb05191100d2b919ea9da9fbcd94c44f530c1148f3
font_01_sfnt_off0000783e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x783E 11008 bytes
SHA-256: a0c3420a6fac0696960d8d573da0ccb02da7192253bc03f86973be5e05d51ca1

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