Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df87b836cf09263…

MALICIOUS

PDF

43.3 KB Created: 2020-10-04 00:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c93c881419d91d69256ae5b082367339 SHA-1: fa0d3af40f60e07d3703b2e6e9ed922626095151 SHA-256: 2df87b836cf09263ac57e44f77fcc6f1a4cf8c6e0270985d6efe8ae6d4d75bbc
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://ggtraff.ru/strik?keyword=hogwarts+mystery+gobstones+answers+penny In PDF document text
    • http://files.mallvisionus.com/uploads/1/3/1/3/131379769/92793fde4e.pdfIn PDF document text
    • http://files.patrickboyle29.com/uploads/1/3/1/4/131407767/dixowaxere.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0486/9249/4486/files/xuxawama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9954/0641/files/lurking_variable_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5215/4532/files/craigslist_southern_illinois_campers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2898/6531/files/lulijogaruvakatom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0606/6325/files/gobadizitivaduromoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9160/8227/files/novus_scratch_remover_for_glasses.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/7978210483.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3775/1453/files/love_nikki_cheats_codes_june_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/wofututitunawunisa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9346/9605/files/hidden_gun_safes_for_home.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3585/6543/files/romono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0141/1744/files/oak_harbor_school_district_summer_lunch_program.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4669/3795/files/84705928942.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE9 5144 bytes
SHA-256: dcb4315cdca10b1e12d0cebf68ff415c59193c73dbb8937253f58dd04c666498
font_01_sfnt_off00006f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F54 10208 bytes
SHA-256: d143b4ae58fa7ba42541c0d9ef933963320f93d6b8138f4620a9b56bdc73f819
font_02_sfnt_off00009246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9246 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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