Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbef2282c4e56873…

MALICIOUS

PDF

37.8 KB Created: 2020-10-26 01:56:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 286b2596974d26f6f3564b15a57d234a SHA-1: e0fc114140479d39ba66681538840bbe35a95a57 SHA-256: dbef2282c4e56873f7efa2053653a3f94cdbbac48b207985a0a09a5628538387
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/pify?keyword=essentials+of+stochastic+processes+rick+durrett+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5f88530977b00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f874c6b73143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5f90a0a020124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f8d6431de4bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_5f93abe967980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_5f8c44023ad30.pdfIn PDF document text
    • https://gijakumode.weebly.com/uploads/1/3/4/3/134306186/63a67.pdfIn PDF document text
    • https://jejoduruledeg.weebly.com/uploads/1/3/4/3/134396934/38a1a435951fd.pdfIn PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/setusutusogudagapeko.pdfIn PDF document text
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/zexixakax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5f9119ef95cff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f89b907a93a4.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/1/0502/1673/0799/files/job_motivation_journal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/lion_king_comic_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7819/8464/files/fexibonuwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1773/0713/files/rotomagab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9709/4819/files/79705613815.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4155/8175/files/carrier_parts_manual.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_off00005310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5310 5264 bytes
SHA-256: 604356e7a595f6e1b80bc85d31fd2565677a58ebf052402fe999b89b47fe187a
font_01_sfnt_off000064ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EC 10776 bytes
SHA-256: 5db3b30c944857e557bb2461a337926340c8203bbf72638d2e1ea10d4a613d3b