Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b793e0b32284a8…

MALICIOUS

PDF

44.5 KB Created: 2020-10-26 11:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 658e50d473066cfd98ae3e47c64ee97a SHA-1: 3535018cbadd2f9845cb40219cca10603274e598 SHA-256: 90b793e0b32284a85c8aab1597cf1fe7f5775c8140f91dbf64bf208584a54b49
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=biosensors+types+and+applications+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5f969690dde07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404107/normal_5f9437269c907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_5f958153ef57b.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/3801a827-453b-4dda-b68e-c6f252ffae57/wodupemizigurukedulura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325cc941-1d75-4501-8cdb-edcafe97d113/95110139123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f9336a-b31d-46ca-a9b1-e3c0ea1bcf4e/jane_schaffer_paragraph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc799a68-5022-4608-a466-e177030e6ac8/xiwagikax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd37c9d2-fc38-469e-a0bb-b3060a3f2fac/zuwolevafazuzude.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/zoravizixa.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/duniraropisa.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/35678630119.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/literacy_centers_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/prepositions_of_place_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8385/2704/files/factoring_perfect_square_trinomials_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5274/6920/files/gerak_translasi_dan_rotasi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1791/4533/files/kefevukolewixem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8140/9713/files/99549349879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5074/4478/files/wamuzolivodixukukabizel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadca474-78f4-415c-b838-b0db6f0ea140/5483461216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2aa1405-b72f-4676-879d-e7a652b4477c/duxelojexupuditizerowaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bc5a33-4312-47d5-9ae8-5ec434c79ba2/wakimadabonavapegab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d00692a-41ee-4cfa-b92c-41d27ed83cf6/tazeloriguragatofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6136/1821/files/40671532330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7993/5150/files/ryobi_shop_vac_attachments.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_off00006d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D95 5300 bytes
SHA-256: 846c551fb3471eab57e35d183b2221ca1e496f0db43d7b1c5bcaba3279f31531
font_01_sfnt_off00007fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA5 10772 bytes
SHA-256: 04fe9f0f8019da1455f8e21051d594c567673beaec4a59254730b61f1c0fc3bc