Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b8ecdef8c319d7…

MALICIOUS

PDF

43.4 KB Created: 2020-10-09 02:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0c7eadc0903f51fc42b8b36dc1ce0e92 SHA-1: 40ef3960b9751c8a3e30e8de25f2f98c949fb747 SHA-256: 66b8ecdef8c319d712e48c6212f0b6f981ce1ef5e3b492bafe54b5ffe1303ea3
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/strik?keyword=surviving+an+affair In PDF document text
    • http://goleji.annawitte.org/uploads/1/3/0/7/130776367/48aa61.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/b36404e7-e4a7-4a49-a189-4eb674aaec67/67366082097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9547ff9-c66d-442c-b5d2-ea9ff371dc37/lewamuvem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd8bbe7b-cedd-41b0-a1ee-6d5aa48ad7cd/nuwinasireva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa450e3a-5c14-46c8-80d2-1ef52cc8ecfd/lufetije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8a73d5-ed52-4c7c-a8e3-5bc044322a62/xitavolivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/155d1fd2-a511-4a81-8523-b7f1b558c3c1/jedolorukodelelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b8c967-3bf5-4295-ac19-a5d6e047777e/97357582829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f990260e-665b-4d74-893c-dc66afb9e46b/zonul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08260ef-caba-4fa4-96d6-d4e7374f149c/25070414480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e96ad8-bcb6-4762-9f5f-c30d3b141dad/79586742908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b4c2db-a9d2-47f7-8d09-23593ca2b4f2/14845280482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b19766ce-3426-4782-a57a-d848c6df3954/tiverojozas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e71c86-0a76-411d-a9a6-d5044320af10/wixakurivurosibinotugejar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b93bd78-ff9e-4d32-a2c3-731447a6bc96/xusikonuremunozaga.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_off00006c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C66 4888 bytes
SHA-256: 22a49dd19322a04fae8a1ae92877e7f4285165b7a58dd8019e54ed4a686d8fb9
font_01_sfnt_off00007d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D25 10744 bytes
SHA-256: 9f8e2fa6e9fe7df1badcea7670be48d82eefd2ed3dcd13091af0a06630c9bb4f

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