Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f6b66d51c7f2ff…

MALICIOUS

PDF

44.4 KB Created: 2020-10-01 21:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b92e2925bb0d9fdbd2a5bc4cf6c59539 SHA-1: e64930bd87d7f54d0c0955d091228ec40c4ff2f9 SHA-256: d6f6b66d51c7f2ff58db30ab1ddd31ef8f8a6517453ccfd338d97dfc6e3d0d3a
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=public+finance+and+taxation+questions+and+answers+pdf In PDF document text
    • http://xegenikam.cathycarterartist.com/uploads/1/3/0/7/130775565/e747448a7076.pdfIn PDF document text
    • http://files.hallielee.com/uploads/1/3/1/0/131071151/lupiwodilusam.pdfIn PDF document text
    • http://sitos.carolinastormhedgehogs.com/uploads/1/3/0/7/130738546/9650861.pdfIn PDF document text
    • http://files.dveart.com/uploads/1/3/0/7/130738777/f24b3eb068c8ecd.pdfIn PDF document text
    • https://site-1037230.mozfiles.com/files/1037230/48782984160.pdfIn PDF document text
    • https://site-1036625.mozfiles.com/files/1036625/zavujo.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/18057377423.pdfIn PDF document text
    • https://site-1037184.mozfiles.com/files/1037184/sujepafirisitinexon.pdfIn PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/13842922074.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/1/0437/6759/5165/files/vault_survival_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0456/9173/2127/files/73351198313.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9549/4307/files/52685930154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9778/3458/files/greene_county_assessor_mo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4891/9459/files/29555174150.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_off00006f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F43 5576 bytes
SHA-256: f1c0c4cc2076c99794efa8f66669f436a69c387641205fe9ef5813c26ea4d8e7
font_01_sfnt_off0000825a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x825A 10088 bytes
SHA-256: 27957b5a0825895299455aa811df9834e6dabdb77034ecdf346aa39571762e78