Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fe06837848e191…

MALICIOUS

PDF

54.9 KB Created: 2020-10-07 16:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: aa7c295c6737adaa3a851c6f6af3e826 SHA-1: 6cb36483051d53666071ea4f2e001a7b67d527e2 SHA-256: a5fe06837848e1913d9413b5b58f1564869bbecd342b38f9643bbaf71343e230
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://ggtraff.ru/strik?keyword=infix+to+prefix+and+postfix+conversion+pdf In PDF document text
    • https://site-1043562.mozfiles.com/files/1043562/fijixofagiwilutuna.pdfIn PDF document text
    • https://site-1038788.mozfiles.com/files/1038788/zatejosof.pdfIn PDF document text
    • https://site-1038759.mozfiles.com/files/1038759/18291596191.pdfIn PDF document text
    • https://site-1040251.mozfiles.com/files/1040251/93718489976.pdfIn PDF document text
    • https://site-1037212.mozfiles.com/files/1037212/sasiwepog.pdfIn PDF document text
    • http://files.r3nets.com/uploads/1/3/2/6/132680796/8282501.pdfIn PDF document text
    • http://tagiged.jinternship.org/uploads/1/3/0/7/130738731/kanidaxakisozis.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/1/0440/6129/4757/files/highway_hi_fi_melbourne_fl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2303/0693/files/zenenuvato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/4963/0113/files/1236359525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/8167/8247/files/manual_brick_making_machine_in_kenya.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/6761/5648/files/kezokiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2310/7749/files/97765771065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9399/3893/files/83442800677.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_off00008f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F22 5180 bytes
SHA-256: dd498bf7f822e4adf924e70fb50ceef335f1ad8989210c5ee04a08bd63ea10cd
font_01_sfnt_off0000a0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E1 14596 bytes
SHA-256: 1db916a132656b10df369b576eb9e39e6f435e4054c225608db2590d23a18bee