Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83e73aea7afd962…

MALICIOUS

PDF

43.9 KB Created: 2020-10-26 01:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 98598ff13bfb84be5428a75749594f08 SHA-1: 2a4759c1dbef1db6fa321cc199cfc0f5f408293c SHA-256: e83e73aea7afd962709893a5b9ac450f2899433326da2977ec2daded1a8c622b
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/123?keyword=fnma+401k+loan+guidelines In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5f922b29516fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f8b2dbdf3362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_5f92a66b1cd48.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/9577244.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/titilegovaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006beb.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006beb.bin)
    • https://s3.amazonaws.com/zidosozawok/mojilu.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/77308184418.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/e_waste_management_in_the_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c98204-4133-4793-9bbf-2200f0209ebb/69404784476.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2433/4496/files/modified_instruction_for_ell_students.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8343/5674/files/little_tikes_cube_climber_with_slide_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0387/4967/files/medela_harmony_single_manual_breast_pump.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8340/6754/files/baluvolidazoxewogewab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4378/9727/files/bawaxukirujutusokufo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1708/3802/files/manual_agrale_cagiva_27.5.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_off00006beb.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEB 5352 bytes
SHA-256: 1c90d19209239cfae57cb7a66b633abe02ce181d5691d6ed5b2f785fab61b062
font_01_sfnt_off00007e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E13 10820 bytes
SHA-256: 192d627180ec9bac2ac0cfb323bbf559c7072168e4b205a72ba8e1b8d26e570b