Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b87d798d45bae80…

MALICIOUS

PDF

45.6 KB Created: 2020-11-02 17:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 049fd02aec14379592ab30de26ecbdea SHA-1: 96235e121a5aa67bf75653e3b8ff6c3e2553aae4 SHA-256: 6b87d798d45bae8016577e8097e0f07b3a22c812f2f06732b3884dac9e585be5
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://cctraff.ru/123?keyword=saginaw+bay+fishing+report+blogs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379613/normal_5f94830531e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f91ae0196ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f8f43aea6ff1.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/luxuvuditowi.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/0b38bf60dfccbd.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/zelex.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/japixij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f8b1bc7ee28f.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006560.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006560.bin)
    • https://uploads.strikinglycdn.com/files/e76a8a79-16fa-43e7-9e8b-e1f50d220c0b/72790995692.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/printable_2020_calendar_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf3ddc9-a752-4e2b-8daa-c3ca4c635686/tukixifovigix.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/aspectos_biologicos_de_la_adolescencia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f473a79-2b0c-4bc4-8260-b3e18a36d38e/26188941871.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 extracted file (font_00_sfnt_off00006560.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6560 5600 bytes
SHA-256: c768b1cc406c7e06460c1c140ba9f1f38bdc86c454ae12104cf176891b1dca29
font_01_sfnt_off00007877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7877 3356 bytes
SHA-256: e5df4e32d2c9b84cb07da55e3a14080ee3c966c4ec95248c1bfeb23acc3a1f34
font_02_sfnt_off000085c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C3 10432 bytes
SHA-256: 733516f59501e74282f93b7b6b55dae4348e56d457579eb1f74510e18f1ae390