Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8602c9ad43f629f…

MALICIOUS

PDF

42.4 KB Created: 2020-10-09 07:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 6e62a5649d7bae84040feb320942c7a8 SHA-1: e0fbec35bd458e9ad1fb13b8775896ae537bf2d5 SHA-256: c8602c9ad43f629fb87fd80ca8174ab1ae53ed4eefa8afc83394fb9315313ca7
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gettraff.ru/strik?keyword=learning+python+powerful+object-oriented+programming+5th+edition+pdf In PDF document text
    • http://nitavixus.sarasotacountysurplusproperties.com/uploads/1/3/1/8/131856097/xekisibobi_tudotajevedad.pdfIn PDF document text
    • http://files.ncmetalbuildingsdirect.com/uploads/1/3/1/3/131398286/bb7bac1eff71aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8ad11c-6f5e-43a5-9649-82c4e2d86420/zezuxapunavawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d86ba23-3171-471d-9a2b-b8d2929bb993/netodamexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1acb1f-665e-4838-9d46-43578216d81b/38322269595.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5463/3638/files/yugioh_deck_building_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0723/2158/files/23005818595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49839f5f-c0f6-4a86-b930-3946aa7de8a1/17205475288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9cb90ac-d738-423a-851d-e56de4c36ec9/wenaxilulezabavas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f384b7c1-688b-4461-a9c7-b8c6e6246f20/nowetugadinavizotudotuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72570124-82da-4605-8049-964c53fd3343/tirebovuwipedozenigezikos.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_off00006310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6310 5900 bytes
SHA-256: 1d99d7fdfacaf456823ca3a3b1e854536ff07fcac5f2da249fad8514a8dd764a
font_01_sfnt_off00007728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7728 11024 bytes
SHA-256: a77a10115fe234e03ae498e094096631fba7046bd099ae62eb1c64dc1da94a1d