Malicious PDF — malware analysis report

Static analysis result for SHA-256 401a494f22a29107…

MALICIOUS

PDF

41.5 KB Created: 2020-11-01 11:00:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 31b754689e9c647fb3382fd3959e5b78 SHA-1: 7c67046cbcdbc18aea88731c986c97e8391a542d SHA-256: 401a494f22a29107a6663c1dde7957bea3e563572a7d1ce1c013b25346261dd0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://gettraff.ru/aws?keyword=bill+clinton+height+and+weight+2016'. The document body, though heavily obfuscated, also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness.

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/aws?keyword=bill+clinton+height+and+weight+2016 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5f9d5b8933eb8.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/1/0433/4449/4760/files/xirekivolifesaniza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8360/2366/files/graeme_base_animalia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0383/8104/files/level_up_guide_mapleroyals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/7476/9858/files/game_of_the_year_420_blaze_it_unblocked_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9160/0568/files/chemistry_word_equations_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6845/7113/files/rekakekovexom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2315/7416/files/earthwise_pressure_washer_leaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3a196a-e4a8-4908-9f85-6af0e7da252d/podekolobuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4846/8631/files/76991369126.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2865/1425/files/juvopiguwikajozute.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1275/8426/files/68023485950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2653/7378/files/clay_paky_sharpy_plus_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/delapagunomubujamabawo.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_off0000646b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646B 5548 bytes
SHA-256: 3d2d106767acaec4526ac8762328bb507d863bef5ff884d72de06588eb0176fa
font_01_sfnt_off0000775f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x775F 10008 bytes
SHA-256: 105ec0ef47038c04fa1338fee94a0933cd12472ac81d6fd064549703b115f9ae

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