Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc5cdd8c3efe3c3…

MALICIOUS

PDF

41.9 KB Created: 2020-10-19 00:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b5a7aae85faa63d5f55b95ea6c8c52e5 SHA-1: 58cd7466195da9d199ae04b5d750062a70fefa44 SHA-256: 3dc5cdd8c3efe3c33e230fa6b3184605044f7c0ad26f8099a80d58e035bbd4ef
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous embedded URLs that point to external resources. The primary malicious URL identified is 'https://cctraff.ru/strik?keyword=zte+pro+max+reviews', which is flagged as a known malicious redirector. The document's structure and the presence of many links suggest an attempt to lure users to potentially harmful sites, possibly for phishing or malware distribution.

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://cctraff.ru/strik?keyword=zte+pro+max+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f871c9c65824.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/1526823.pdfIn PDF document text
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/280ba805d.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/9bcbecf63.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/4633509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f8730e7993ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5f8cadad58f18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f873001e0b63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8730322c7dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f886f5a0a48b.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/9945000.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/5213414.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/funifovi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8494/6850/files/jamewag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6383/5814/files/kigidobogulipupizenibam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6623/1446/files/b_bus_schedule_new_haven_to_boston.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1beae01-09b9-4eab-83b0-9b9ebf1f83af/38943741351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c012ec4-4cde-44b9-bae1-88521f0a1ff4/21866747449.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_off00006599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6599 5112 bytes
SHA-256: 6ac9fe526e7ca56a2ef537e8432914acea588494e136a44e5f7798fbcf07e7c9
font_01_sfnt_off000076fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76FC 10496 bytes
SHA-256: 6af0bbf264d6091c7d22ab81102de136d47f90e5e719bf03769fa3480d1aface

Open this report in the interactive analyzer, or submit your own file for analysis.