Malicious PDF — malware analysis report

Static analysis result for SHA-256 553b70841be4a9fa…

MALICIOUS

PDF

40.2 KB Created: 2020-11-05 23:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f5e75d835e0625d3cf68b74081079e77 SHA-1: 4fc63bfeaea332fabf0dcad0b4a5c2516847e3d8 SHA-256: 553b70841be4a9faf1dfa22017b683b8dceef62997ca72ea6913d4fb096a8ed0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a coordinated effort to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign, likely involving SEO spam or content 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://traffmen.ru/123?keyword=the+ultimate+energizer+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f9439015275a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_5fa2f38370bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f8c2591d8166.pdfIn PDF document text
    • https://gixawixo.weebly.com/uploads/1/3/4/3/134322292/802783.pdfIn PDF document text
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/tisuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_5f9d50badb9c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_5f9b84ff1b3dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5fa0628eb31b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5fa01f337fe00.pdfIn PDF document text
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/5882351.pdfIn PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/punibomade.pdfIn PDF document text
    • https://lijonalorobu.weebly.com/uploads/1/3/4/3/134340538/fd61d849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5f91f124ab1c9.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/56aa191d-0d27-4483-8acd-fc2b651737a0/romeo_and_juliet_long_answer_questions.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_off00005e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E16 5276 bytes
SHA-256: fd81c31f2aa51d53c14d9d537805e61f44647d240c0f446fd302d4e5649e4f07
font_01_sfnt_off00006fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE2 10580 bytes
SHA-256: 4e4edd8fa16e9e3f66c7212aa38c9c3518160006c83e06c14b7b5abfe7911b90

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