Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6c0ba7ffc0e73e…

MALICIOUS

PDF

52.0 KB Created: 2020-10-16 11:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 81be45cb6ea52ba8dd942db6c8b78e9d SHA-1: e8addd15e3dfe5fc02261bed22223faa10ac45eb SHA-256: 4d6c0ba7ffc0e73e04c03032270052764283e62155d2ee12fc83b7fd93f7b0d1
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=final+cut+pro+10.3+tutorial+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_5f88a0ff506fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f87a1484f9b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f891ff0d5721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5f892d852425c.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/1/0496/6278/7733/files/kpmg_internal_audit_interview_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/6779/4342/files/dumetigekasoti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7659/2815/files/community_ecology_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ddee73e-316a-4bd4-9122-0617b8341cf5/36561092900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5efeeed-f102-4a72-aef6-71b834b40eb6/22477077746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12d05e77-37c6-4fd7-93c2-740ac8b7c85b/tudebokuwifaguje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a090cbf4-4268-4839-92ec-f329c7ded4d5/44754006495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4699/4588/files/lekunivefulipusoxexel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/3305/9479/files/56148519259.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5889/5254/files/17967144915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/093789f9-66f0-44f7-b6b3-8142e03527d9/boxajinukafujonet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db3150a-865a-45a6-97e9-a580a4614e05/97963216068.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_off00008b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6D 5316 bytes
SHA-256: ee4204b2eb8476652ae592db16f1902707c8fe6c78c9af360080c2fd603300a6
font_01_sfnt_off00009d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D90 11076 bytes
SHA-256: 88e16c95c20c1343be7c057fd0acfcb5a0538918012f000f09dc0da9343d04ac

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