Malicious PDF — malware analysis report

Static analysis result for SHA-256 a169eb96f69132a6…

MALICIOUS

PDF

36.6 KB Created: 2020-10-31 14:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ec753086d5c7fa84993683ef1960de35 SHA-1: f6b952e4cec500b485097c829e661e01d4abfe5a SHA-256: a169eb96f69132a64fa6fcb8f076df6b3491ee4c7bc8a20ef6fbbe0e96cbbe14
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://ttraff.ru/123?keyword=synthetic+division+sudoku+answers In PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/jedaxipatab.pdfIn PDF document text
    • https://nulumekut.weebly.com/uploads/1/3/4/3/134373747/wifawupu.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/5401885.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/xodamopusupozan.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/3442074.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/henghuili-files/buddha_story_in_kannada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a551ceb-f9f9-4415-b1f4-1854d881bf0e/kenmore_ultrasoft_400_water_softener_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cdd285-a652-49c0-99d3-4ca0949646bf/9790717208.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/alkali_dan_alkali_tanah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9126/8262/files/12351592185.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0937/4368/files/fau_alumni_directory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4828/7904/files/oblivion_sword_kingdom_hearts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/7063/3140/files/35363918185.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_off0000512c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x512C 5416 bytes
SHA-256: 818284786b69f8906ce18414681bbe3343a2c3ca42f383b77ce17e87834a59e5
font_01_sfnt_off000063ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AC 9908 bytes
SHA-256: 8cf5c4f6bc0d6e12495a8ff191c4e5f523bb77e6669d4957d1d522d81c6ed6f3