Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92c958da8dd06c7…

MALICIOUS

PDF

45.7 KB Created: 2020-10-25 06:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 6dac2d0a4aede33520748219ed63c6ec SHA-1: 37482ac93f27741c836a518ed3854cc02e5ca76e SHA-256: b92c958da8dd06c7663c364ac2ad2e6ef1bb476889b248337fb5d35f8d9901a7
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=ecrits+apocryphes+chr%25C3%25A9tiens+tome+1+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f881e5d7bd14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5f8e88a0e3724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f8ca5d99f61f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f8b997c5611e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f872f789da31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_5f94cae4bf9bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5f8d6f1628fbb.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rezareludufiven-voxodopi.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/foburadip.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006d06.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006d06.bin)
    • https://cdn.shopify.com/s/files/1/0435/9572/7007/files/qurb_shot_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6940/2009/files/65610259702.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9270/3915/files/fowotufijukixiron.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5255/6184/files/makalah_pupuk_kompos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9778/7041/files/barbee_lake_fishing_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/57155074901.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3356/5096/files/xaturofu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3382/4927/files/sopeluzoxoputuku.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/jifakepem.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/boltzmann_factor.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/ctet_prt_syllabus_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/catalyzing_wealth_for_change.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_off00006d06.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D06 5616 bytes
SHA-256: 01b59584b910b563c9083858c0b07bab79d1e0db6c65b84c2e722933098c8630
font_01_sfnt_off00007fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC5 12396 bytes
SHA-256: 4b198ab60abfca9574af4a98d766b8bcd5a556f72a32284d3d37a054808d42a2