Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4593c6b4725b614…

MALICIOUS

PDF

70.3 KB Created: 2020-10-01 06:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d1dcfb56c4ba4e0d6881b6cf8f569f2b SHA-1: cac8442973de5503679b32db06e8ce2a697c4b69 SHA-256: a4593c6b4725b614c2a06f7cc1cbc7f6adbf61075e5287449edf423bc288bae3
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://gettraff.ru/strik?keyword=classification+of+congestive+heart+failure+pdf In PDF document text
    • https://site-1037887.mozfiles.com/files/1037887/xogewugigaguxesizi.pdfIn PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/nukemexarexet.pdfIn PDF document text
    • https://site-1036821.mozfiles.com/files/1036821/namisinaxumava.pdfIn PDF document text
    • https://site-1037276.mozfiles.com/files/1037276/besininokimedubeximex.pdfIn PDF document text
    • https://site-1036655.mozfiles.com/files/1036655/ferelomega.pdfIn PDF document text
    • http://somota.truelifetalk.com/uploads/1/3/0/7/130739607/40a1e1.pdfIn PDF document text
    • http://files.saintsprotect.com/uploads/1/3/1/0/131070149/vajejasaveridori.pdfIn PDF document text
    • http://files.salinenextgen.org/uploads/1/3/0/8/130874478/3800294.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/1/0486/1719/3637/files/57200341442.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9426/9333/files/metformin_weight_loss_mechanism.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/bovujadufijojusunab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/3980/0734/files/76543004309.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2084/5210/files/epf_online_form_15g.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5427/5479/files/45181916213.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/5421/8646/files/jikuxuliwavogaruvoxelul.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_off0000d0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E6 5384 bytes
SHA-256: 840eaf997ffd00f1d0c744ba563b8d34a2f2eca6820621953bf10830bb1fff20
font_01_sfnt_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 12276 bytes
SHA-256: d7ab2a2eb6d42e131c00563c647e364201ea869e8bc95f45218f4c7e27115e72

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