Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb425c06fe9d00c6…

MALICIOUS

PDF

40.3 KB Created: 2020-11-03 18:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 010a1ab6fe0e674ddcf14a877962f131 SHA-1: 342a54506ccfedd1ba31c7150841db407b0a69e4 SHA-256: fb425c06fe9d00c6558a724aaa867feb7f46d7a71fac272a14595b1202dfba7e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, masquerading as a user manual, that point to redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that one of the primary URLs, 'https://gettraff.ru/strik?keyword=asus+vs248+monitor+user+manual', leads to known malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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://gettraff.ru/strik?keyword=asus+vs248+monitor+user+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f978e1b659b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f895cbabf97a.pdfIn PDF document text
    • https://vejuvofarazaxar.weebly.com/uploads/1/3/4/3/134355137/1327030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418369/normal_5fa08db22354e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5f932638663c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_5f9dc925b8850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f87dd81acb10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3203/9583/files/zirakevidonuvuwofoxase.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/business_email_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/grade_5_3d_shapes_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5267 5176 bytes
SHA-256: 1a3c10e9dbbfc3258deb0efd54a3a668cdf2d96c47aad28c0d21aafb08126e7a
font_01_sfnt_off000063e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E9 10104 bytes
SHA-256: 522caab0c44e36874096a7a8f22dcce2059c28d2a1dec9398436fe7b2501009b
font_02_sfnt_off0000866f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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