Malicious PDF — malware analysis report

Static analysis result for SHA-256 b496ec8cd1ea6114…

MALICIOUS

PDF

44.2 KB Created: 2020-10-28 13:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 53a0a43358332f9157fc24d0ae85a282 SHA-1: ec9286dbdf08c20e30bd901ff196f4f988e170aa SHA-256: b496ec8cd1ea611487b4c0e57612e61223431ba347ac995d50312331b66cc81c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 at https://cctraff.ru/strik. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF files, suggesting a link farm designed to redirect users to malicious sites.

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://cctraff.ru/strik?keyword=brush+up+your+shakespeare+sheet+music In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5f983278d3866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5f8bf7e9c19c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5f939bb1768e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408598/normal_5f9546fd656d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f871d2d558ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f8c3a06d93e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f874a0f7988b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8c3bf9c91a0.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/fa62cb5c-d10d-4607-824f-13cdc6e57989/fatubunemadutitigom.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/transfer_function_model_is_applicable_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f848333-33fa-4eb9-9fcb-c84288a45577/melimonoterojoxud.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/the_tempest_summary_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4853/4167/files/phn_mm_dch_ting_anh_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2724/1879/files/contact_angle_wettability_and_adhesion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9767041-787a-4c3b-b196-6798484132c1/husqvarna_345_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65857113-0e96-47fd-8607-80fd44549444/64992183844.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5291/9703/files/world_thinking_day_2020_countries.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6629/0076/files/99059097148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd099f7b-38a1-416a-aa1d-ec0a15cd5c48/how_long_can_common_goldfish_go_without_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f140a2-62b5-4fde-84cd-beb671821273/88785848873.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/zikis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45452717-aadc-4fb5-8cf8-dab84003d562/19447121946.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/dikiburilasokoxiwili.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_off00006b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B86 5356 bytes
SHA-256: 03dc933b52c7a5fa87d939d0a4dce53ace76114e9d1edb2f40407be4bcfa79ee
font_01_sfnt_off00007d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9A 11536 bytes
SHA-256: d7a21ca1abc6ce92a33bb7147b3cc8ca38d869f13e6d7606a6728a9e10f61412

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