Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ab939cf87cda42…

MALICIOUS

PDF

40.7 KB Created: 2020-10-30 00:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 20b09142ad4e4c4fd5eec9e6ae756759 SHA-1: 77f0fa89070895c1cfd5fdfb9c83c135b1dd03a4 SHA-256: f6ab939cf87cda427cb053fe4a5fceb68cb117efb7a0c5cccc0b43f6d4a8d721
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/aws?keyword=math+tutor+dvd+llc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_5f8e4802e9b5b.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/6763278.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/5702700.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000061e9.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000061e9.bin)
    • https://s3.amazonaws.com/fapaga/blogspot_books.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/83462491738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86681800-fdc7-42de-9fdf-6395fcc688c1/kolevufuvefanavepeziguma.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/cfa_2018_curriculum_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9712/0676/files/4345270731.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/96867361110.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/life_size_dolls_for_toddlers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7439/1709/files/qureka_pro_all_version_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/nopiwuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad32e3a-7432-4b4f-8bac-d88a2e146db4/denugetiruzu.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/fifefelekajitokox.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_off000061e9.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E9 4912 bytes
SHA-256: a6a713172123d6eea68e77199a8d59d42516d3bbe8ed786da7452decdee1e825
font_01_sfnt_off000072a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72A9 10436 bytes
SHA-256: 76baf40b90c83276838d587218afb5e0ab92d97b7ddb0af3a8e0c08868dee3ac