Malicious PDF — malware analysis report

Static analysis result for SHA-256 7673d2a1bb98fac5…

MALICIOUS

PDF

44.4 KB Created: 2020-10-26 17:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: b53a4e731753fe8d18c9733d7039e044 SHA-1: 12fd0c658df77e08d8cd0d3bdfc402a63b11c3ea SHA-256: 7673d2a1bb98fac58a19c2849dcfaea20defb4c71ace5d2088d6e826def62291
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=uranyl+oxalate+actinometer+pdf In PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/larulepa.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/672411308.pdfIn PDF document text
    • https://zafojepomekosax.weebly.com/uploads/1/3/4/3/134352399/kafivudinezoxuvep.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/1835335310385a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f878db4ba669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f875edf66fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f8735ffcfbb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4956/9434/files/jijosorijawid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/educational_research_quantitative_qualitative_and_mixed_approaches_7th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8852/0382/files/wasavewovoxizatubizemonog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5940/7765/files/programming_collective_intelligence_latest_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/acknowledgement_samples.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/vizaxopuje.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/hernia_inguinal_anatomia_y_fisiologia.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/13354501561.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/49096678970.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/us_criminal_justice_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d81b5189-c614-44f8-ac32-54d669fc133c/ravotatixilutujex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/011ee870-7195-4abc-ad95-53643c930b19/78050819713.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_off00006d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D59 5284 bytes
SHA-256: c1469003d043dc028f32a96800819d6158f17a794dd87558ac278be9078393e7
font_01_sfnt_off00007f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F49 11128 bytes
SHA-256: dd673b4990f1793ebbfe1853a6f49137b77600f5a4edf59a9e828bb6d677324b