Malicious PDF — malware analysis report

Static analysis result for SHA-256 6726b01811fe8dba…

MALICIOUS

PDF

66.1 KB Created: 2020-10-23 10:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: dad9afc745389a6b3aa6efa747dfc3aa SHA-1: ae54556c44ed0d6a073d10a6d5fbc3efabb9865e SHA-256: 6726b01811fe8dba6190dccbdfed084555fa7b1b80c3b81079784e005ecc5dd9
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=obligationenrecht+arbeitsrecht+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5f8fd807e3293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5f90c18f416d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5f8c51f76cc08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f891c7acb413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f8f8d3d83056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f8cee5fa9fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5f908feab4f8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8755c84797f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5f8c7a3a995f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5f927ddae80c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f927419263f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f8e3e5c17772.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/e6646278-1d52-45bb-9b8b-6b34bf336615/67552072777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60876cbc-0fea-4a4d-bd59-61b1c9986e16/miviwiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12188ee3-90a0-4dd1-a225-f1b3ad3cd3e0/39891759151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce4d72c-1b1b-42e0-a02a-d5296772f9c7/biochemistry_satyanarayana_5th_editi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9545/0534/files/ecocentrism_and_technocentrism.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/91146113723.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/60200322152.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4106/3590/files/wiat_iii_examiners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7010/9890/files/consenso_urticaria_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/all_branches_of_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/nikeruvireges.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/materi_akuntansi_manajemen.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_off0000be80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE80 5584 bytes
SHA-256: 30d065a0d2035c08d690ac555781dd1327a704f62599ed8bccd564c4a575ce28
font_01_sfnt_off0000d168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD168 12128 bytes
SHA-256: 3ab194e70da2d87e0c02ce5bc1458c7bcc1d0d38db09beebb2674df6a207ed7d

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