Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8a5f739fa8ea43…

MALICIOUS

PDF

35.1 KB Created: 2020-11-02 18:58:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 17fc427f507f31e0773f56c3d6a6e82f SHA-1: 2be9f304f66710f42ad10c8dc90459a5e8239be2 SHA-256: ac8a5f739fa8ea43ca4eea5731ae2c14ab8c6964267d7a9f55e1fac28d770871
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple critical heuristics, including a malicious redirector link and a PDF link farm. The embedded URLs, particularly https://ggtraff.ru/strik?keyword=go+pro+by+eric+worre+pdf, indicate an attempt to direct users to malicious content. The presence of numerous external PDF links suggests a strategy to obscure the ultimate destination and potentially engage in SEO manipulation for malicious purposes.

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://ggtraff.ru/strik?keyword=go+pro+by+eric+worre+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5f973bf7bda9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_5f947b72bb59e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_5f9a4a93ad69d.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5648329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_5f9802beb565a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_5f9ccea5da91f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f93ef1dbde31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413113/normal_5f98332d80c00.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/1/0500/0386/9856/files/ginumogirojuporebatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2deae2a8-55df-478f-ba25-e20aa5091040/28819753156.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3226/2814/files/10794893905.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4130/3975/files/36819359524.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7704/1304/files/vizio_smartcast_sb3651-e6_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c22d32f-b392-42e2-8c68-bd9fb5471795/4169257209.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_off00004a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A16 5096 bytes
SHA-256: ac8539e97bfed0271a81e4604286c868f6a6ffcef9f2c3b62d77dfa7c1488805
font_01_sfnt_off00005b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B93 10772 bytes
SHA-256: 7a1025e13dcdfeb3514aa76d4bec4794895643e6266967bd78101c75c013e3df

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