Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea376344f381c8f…

MALICIOUS

PDF

50.8 KB Created: 2020-10-15 04:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6f4f0ce32474a6b7c9f0bc947c2baaa2 SHA-1: ed2b0bef0532aeb24abfc944cf63fb52beeafedb SHA-256: 4ea376344f381c8f1f8c8aea146c3a72fec9bc9d06c6ea23ca4e2d59fd3c0a94
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by a machine learning classifier and heuristics indicating it links to known malicious redirector infrastructure. The document body contains numerous embedded URLs, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The primary malicious URL identified is https://cctraff.ru/strik?keyword=3d+shapes+worksheet+for+year+5.

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=3d+shapes+worksheet+for+year+5 In PDF document text
    • https://site-1037279.mozfiles.com/files/1037279/javodibaluwexufuwogiba.pdfIn PDF document text
    • https://site-1037833.mozfiles.com/files/1037833/49840908692.pdfIn PDF document text
    • https://site-1040443.mozfiles.com/files/1040443/buponepoguvogigejek.pdfIn PDF document text
    • https://site-1038401.mozfiles.com/files/1038401/mibisuvolilibulanowagade.pdfIn PDF document text
    • https://site-1043121.mozfiles.com/files/1043121/469588318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f87a58f4e3db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f87a79e4b4eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f878de133525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f873ceac9704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f86f4d761046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f87a3a2ddae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f876f48d6af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f87810b705e1.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/1/0430/0183/9769/files/tonupopidelogapow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9933/0462/files/tuvakokadotakiwogu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2193/9100/files/fidotitafu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4703/0436/files/punakabuxiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdad94e2-5019-4a9f-9e4d-cab00a233f65/mipizugalipurigalum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/289a4738-bcfa-4742-9e4d-33ac1b9ade1d/lidegibosupilefajafale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14468519-38fd-443f-9e75-c067c0e220ce/nemaxilavogofevuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99ab276-8366-485b-92ad-3466054e6b59/9644221378.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3C 5548 bytes
SHA-256: eb1c40dac5a26e0424444f747bda15622147777b81674e289589339ff4407a36
font_01_sfnt_off0000812d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x812D 10252 bytes
SHA-256: 86bc1f64aec8177911d85b95ae080d375f2b52a6ccad138776f0495edf4216c9
font_02_sfnt_off0000a475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA475 17352 bytes
SHA-256: 738578a50730454724d95eb169c07d73778b47e4c94ab374a2f643efa92b1a20

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