Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b87acbea01371bb…

MALICIOUS

PDF

39.8 KB Created: 2020-10-30 22:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 6184b821324ee0b177e0a3ad3c33d857 SHA-1: 904b5f37c948c7683bd0a2e56e70491221909378 SHA-256: 4b87acbea01371bbf3b81db9c8334732a953699edfcc450b6335ea1e8700139a
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/pify?keyword=knock+knock+pick+up+lines+cute In PDF document text
    • https://xotiroxo.weebly.com/uploads/1/3/0/7/130776105/13903c5f86c70c2.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/leguzolumoxofof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_5f962df9baabb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5f8f6e981f163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_5f9763b46a1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_5f9b7d371e770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409093/normal_5f9416425979c.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/leguvefu/kalnirnay_calendar_january_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/b._ed_books_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b76be3ec-1661-43df-92d0-8a1b56431c6d/85746566067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9920/4000/files/ranking_abras_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7998/0987/files/median_income_los_angeles_county_2020.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_off00006133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6133 4652 bytes
SHA-256: dd11c1e76b107657e61fc20fda0d346971cff1f5d3e15de0a0129840debb9d9a
font_01_sfnt_off00007122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7122 9868 bytes
SHA-256: b814b2a38f55001ae69e496c99080d30e1894a6d668365f30d14826a133e473b