Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a563efeacbf3069…

MALICIOUS

PDF

45.8 KB Created: 2020-11-07 01:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 8c7fe456532bf9e92be299b1fc77b99a SHA-1: 94a3214cd9b91af881ebd29d043f5310dd330b0d SHA-256: 5a563efeacbf3069e12dc6cd28b90184ecce0787249ba1c91379a494e1193b95
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://traffking.ru/123?keyword=pocket+guide+to+nutrition+assessment+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_5f97793d05fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469101/normal_5fa4d3c18bca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420031/normal_5f9cc02edc78d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f9c324e94acf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/toladiv.pdfIn PDF document text
    • https://ranalofegi.files.wordpress.com/2020/11/devavulidekes.pdfIn PDF document text
    • https://sozawubi.files.wordpress.com/2020/11/lubop.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/23543700661.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/vuvemi.pdfIn PDF document text
    • https://fovodifikade.files.wordpress.com/2020/11/34348140425.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/18293116048.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/6578722471.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_off00006fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBA 5508 bytes
SHA-256: b33acdc21efbf79e7440daadd458775c32fccd4b6e661fe6a8033d649de3f7cd
font_01_sfnt_off00008260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8260 12120 bytes
SHA-256: 181557238ca0150ac1f808bdba7001502ae2453c1cb3016592c6cff474cb4252