Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a8dead4a25231f…

MALICIOUS

PDF

43.8 KB Created: 2020-10-16 13:39:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 08a1e3fd49e865d211676e07fe0083ca SHA-1: fb2a8930d371b4c95860f22f50532c1928bc1c1e SHA-256: 23a8dead4a25231f2762831bf8634696442e85a181d807584881b30b4abae422
154 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which points to a known malicious redirector. The document body, though heavily obfuscated, appears to contain the same URL and a title suggesting a worksheet, likely a lure. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL suggests an attempt to lead the user to a malicious site.

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/123?keyword=finding+trigonometric+values+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f875ae981692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f875c9bb2c81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f881aae7fd96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f87548a41d12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5f88405729152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5f88c4e4b6ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5f88c684b41f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f882e284f62d.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/bf083fe5-a48c-4981-a455-03204783ffc2/tigefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/077dbc6b-5a54-434b-82b0-98f5088115fb/36178538508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/722bca77-b752-4933-b9e9-a476d59ffe9f/64252736994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2c00aa-29b3-4183-9d80-ff96efc7be1d/mafotisesapivogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363a2c0e-274b-48c1-ad71-c891a50616c8/24120725390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f938f011-a8fd-4dd1-900c-9e3220fc9cc2/66147972476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b8abf9-a415-4999-aee8-734dc5107e35/27001122405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ab0fad-79d5-438b-9415-09617a71f42d/37999244501.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3884/6371/files/mcguffey_pictorial_primer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9825/8073/files/air_to_oxygen_ratio_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165165db-95f1-4e88-b6ae-ed2a4b704de2/79012534786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f8745b-2833-4cfa-9f6e-6b0617a9fd34/fetefudolugukukodita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a8779d-124f-4181-86b0-b3d713cfcfa4/82268494883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eef07d6-0df0-49fb-a427-c28adda10da0/pojogezodavuxozosodakatuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db602baa-e312-481e-be33-c8d7323e4985/40439056517.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_off00006c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C38 5524 bytes
SHA-256: 06d217d6a7e7fe2f88e18c5b21e8b5f1c1a1a00b0915179663c2639651fc03a9
font_01_sfnt_off00007ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE3 10548 bytes
SHA-256: 6ec20c83803a6cc7f2326d3fb5261a33b6e173e90919848f305378eeff1df529

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