Malicious PDF — malware analysis report

Static analysis result for SHA-256 8393dd5257273414…

MALICIOUS

PDF

42.1 KB Created: 2020-10-29 09:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: ee522144eab8cdeba5f5e5e5373f4a80 SHA-1: ea295b7f0614426bee527ea91c1bc171d775560f SHA-256: 8393dd52572734140e4c513b3b9c1de15ee7ead1b1e153943f1bb170efa4c155
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=haan+floor+steamer+not+working In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5f95d478c11f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423442/normal_5f97d26dd5593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_5f8d75ad2596e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_5f95e43f753ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000066ed.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000066ed.bin)
    • https://cdn.shopify.com/s/files/1/0437/5209/5898/files/canada_food_guide_servings_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/29487120383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d235333-6a54-4aa2-a26e-ae450b8fb608/jagopukunogisunavakuwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7536/2198/files/febufakopodezi.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/20156670130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1716c3-b2f2-4879-b88b-efc02227b4d2/moram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4246627-3811-471a-ad18-3fab7216f643/90644326255.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/usul_al_fiqh_books.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/full_spanish_english_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/63326978694.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/vivune.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_off000066ed.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66ED 5204 bytes
SHA-256: 674e1f071e4321e4264a2abb2d2554c55edb85e1db3402ba071eda88d71dadc2
font_01_sfnt_off0000789d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x789D 10400 bytes
SHA-256: 6549ba383db98580bcf54346be6bf2a2bb38fbda6fb4b2b83bd5a9d49ac1a53b