Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7ff53d872be0d8…

MALICIOUS

PDF

42.3 KB Created: 2020-11-07 10:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0d69314fbfd295cec91f499755fec41b SHA-1: 1f05e3e9a99aae91d7a7c0edc05bb89c6f442a1a SHA-256: 6f7ff53d872be0d862be8df1cdb9149dd28648ec0a50b2e581a0375294cabd36
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed as a link farm to distribute traffic to various disposable hosting sites. The embedded URLs are likely intended to lead users to phishing or malware download sites.

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 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://traffine.ru/123?keyword=lighting+fixtures+for+kitchen In PDF document text
    • https://kawigijutugin.weebly.com/uploads/1/3/4/3/134351661/lexumedojamej.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/1d1f8ecc085ca.pdfIn PDF document text
    • https://betisokoredig.weebly.com/uploads/1/3/4/5/134505727/fae7c8b7ea.pdfIn PDF document text
    • https://rebolotor.weebly.com/uploads/1/3/4/3/134364816/nebupizofinos.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/fa2adb4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f875ddd27441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386829/normal_5f959ad42ffe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_5fa33bc7aa7df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f9565953b99c.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/c066713c-3798-473a-99db-66b2610c8f17/16287936731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6faec43c-a015-4404-8ae6-4e2a50bd5f6d/tepibajewiwudageraporas.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/kiletagejepamazopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdedea88-b290-4484-8ca5-dd2702571714/64517532918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e360230e-74a2-4018-a9bb-d1a054f27089/faxogovum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604f2891-832e-4b78-80a3-51b09f97742b/72338244647.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_off00006725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6725 4976 bytes
SHA-256: c71b6058d89174bb1fc4e354c024e863874c427e9f22787198f40622dfacfc58
font_01_sfnt_off00007828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7828 10796 bytes
SHA-256: d83c1d206156704d53f90e2aa99234036642f7e5dddd5e568d7e4bfae5af7fda

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