Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c08b696102101d…

MALICIOUS

PDF

44.9 KB Created: 2020-10-10 20:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3d27808aa877afd070e45f0883518a5f SHA-1: 322cd8293e99789c0ceda5426bcb5444cc59a96a SHA-256: a1c08b696102101dde7288b5d6710d0d0ab888ba2333400d49f29515eba5115b
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/strik?keyword=harry+potter+and+the+deathly+hallows+book+pdf+download In PDF document text
    • http://files.dlogiceu.com/uploads/1/3/1/6/131636828/temaxuf_xumotusabig_mixizefeg.pdfIn PDF document text
    • http://files.npa-mn.org/uploads/1/3/1/0/131069904/tidul-pufutetigak.pdfIn PDF document text
    • http://files.broadforkbags.com/uploads/1/3/0/7/130776201/2898215.pdfIn PDF document text
    • http://gadeteb.treehousehashomes.com/uploads/1/3/1/4/131438860/4542459.pdfIn PDF document text
    • https://site-1038455.mozfiles.com/files/1038455/todudowafena.pdfIn PDF document text
    • https://site-1039187.mozfiles.com/files/1039187/2503604738.pdfIn PDF document text
    • https://site-1042094.mozfiles.com/files/1042094/vubeniza.pdfIn PDF document text
    • https://site-1037253.mozfiles.com/files/1037253/30641482111.pdfIn PDF document text
    • https://site-1037005.mozfiles.com/files/1037005/77175212185.pdfIn PDF document text
    • https://site-1039330.mozfiles.com/files/1039330/95877151929.pdfIn PDF document text
    • https://site-1038700.mozfiles.com/files/1038700/27888116643.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/1/0486/8669/4550/files/15816847109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8573/5105/files/80217796405.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/bobs_burgers_season_4_episode_18.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4132/4184/files/revolutions_document_based_questions_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9202/4739/files/oompa_loompa_genetics_answer_sheet.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_off00007104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7104 5488 bytes
SHA-256: 9b2af3df286cdc7433e8e4353f29be5ae82b1f7e311036caae4b197f3466a4a3
font_01_sfnt_off000083b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B2 9988 bytes
SHA-256: fd811eac5ea2cf9855dd5a4a9f5ab7871a783d0964ab5f901c5acb2ff49eeb62

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