Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c846e4cdbbabdd…

MALICIOUS

PDF

44.0 KB Created: 2020-11-02 12:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: df454cab4ac34c9d8a2151efc8c7c0e6 SHA-1: d902e878c0c2f51570a082957ae31e185e9bbb16 SHA-256: 31c846e4cdbbabdd57808d479dc813c00cffe0ea1b5b1915c60d6d2233793db9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The document body, though obfuscated, contains a URL that is also present in the heuristics, suggesting a lure to external content. The presence of many external PDF links indicates a link farm, likely used to distribute malicious content or for SEO manipulation.

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=ariana+grande+show+in+st+louis+2019 In PDF document text
    • https://sodejokare.weebly.com/uploads/1/3/4/3/134349501/1045089.pdfIn PDF document text
    • https://vatedubajepe.weebly.com/uploads/1/3/4/3/134371970/lufev.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/5721191.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/2d2b07cd700b241.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/mugozododarulax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/accrual_basis_vs_cash_basis.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/the_addams_family_3_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/jceceb_bsc_nursing_syllabus_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1204/9056/files/50156930007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4034f4e4-eeaa-4265-9478-a7fcdd983a24/ratazejexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4893/2773/files/chicco_reclinesure_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2597/3916/files/morakidojaxusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc260473-b3a4-4228-846f-d90f380ec9e6/mumobapowazag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b824e99a-85f1-4e12-bd0a-f9e164665815/75114348879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7160/9240/files/maple_syrup_farm_stardew_valley.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_off00006a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0C 5652 bytes
SHA-256: 81b353df7792e43a9cdb82aef5d0fef47eb151dbfbea1df26ae4eefca35ddb6d
font_01_sfnt_off00007d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D52 11324 bytes
SHA-256: c8c7cc768960632314c80027fb57e7bde99c0e51e946f1a96d71b36c35244455

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