Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfdbd7dc4b88026…

MALICIOUS

PDF

41.3 KB Created: 2020-10-23 00:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 633d4469503debc7b3dbf9d612ace457 SHA-1: 71c3c162210045933ca17a51636391b8f1cb738a SHA-256: 4dfdbd7dc4b88026f1424c027fac51052183d754b0e5dac0ba7acf83d43adce8
134 Risk Score

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.
  • 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://ggtraff.ru/aws?keyword=lookup+function+in+excel+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5f8f70db8a5b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f914820d1131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f8f604991430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f8c0d96b61ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_5f8e42c6874fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f8a118730828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5f897ca929270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/11779088850.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/83716796172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15bc2d42-3b3d-486a-ad97-c51eb1287513/defolofekaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4abfbca-95db-4f4c-add6-df04e2fe9a5b/57524017556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5eb5253-ad34-4028-b776-72a2a20dd369/48075638649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8ae960-f0e2-4704-a7c6-07ec2a37427b/xobifibozemozize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a93084c-b515-4f0e-b5d8-4403e7652fc6/pabuteruvivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8659/2196/files/dahua_technology_cctv_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8610/3207/files/sogaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8506/2846/files/quadratic_equation_solver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ef19eb-52a8-47f5-a9ba-589413067dc5/31702295134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/731542b9-4a76-4be9-b60a-6b2147649db9/54975661730.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_off00006209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6209 4736 bytes
SHA-256: dcbbbea64be4f493d4a4d97d28cfd2edfe2b67a8a114558cfdb9f543099fbe43
font_01_sfnt_off00007249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7249 11152 bytes
SHA-256: e91e926afeffa2f0b612c205bdcd2297f776aa62e1d6df0e8c57379bfe586329

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