Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ede5a7c9be5319…

MALICIOUS

PDF

42.6 KB Created: 2020-10-28 22:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b3cab4f8dc391b29d68d0deca5b146fe SHA-1: f42f75d73aba1b72d8e9c1d19e16cacfd4d6bb7d SHA-256: d9ede5a7c9be5319eb9e7fa980f42a904b4e70ee8ae7585c7592e5665043f72c
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/strik?keyword=american+government+magruder%2527s+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_5f97d00ae0f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f97035ed59b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f8d059006b3b.pdfIn PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/sanamosux.pdfIn PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/mefilodexemibowefo.pdfIn PDF document text
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/8915768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_5f96bacf867ec.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/jozetej/algebra_1_common_core_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/gavabagovuvofafaniradurel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/9221767115.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3025/6536/files/how_to_create_bitmap_drawable_in_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/giorgio_agamben_the_open_man_and_animal.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/birla_sun_life_mutual_fund_application_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7350/1884/files/karate_olympics_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/97305815132.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/93134804216.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/primer_of_public_relations_research_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/caballo_de_troya_9_espaol.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_off000066fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66FD 5524 bytes
SHA-256: 341735c8df413558686a1ea5696f635e0ffcef35748ba8dfe577531753c4fb98
font_01_sfnt_off000079bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79BF 10492 bytes
SHA-256: fb4d9a7543cfd906cc474c5d6412a9a29225cc58068b46b7bae1135ffa0e5fae

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