Malicious PDF — malware analysis report

Static analysis result for SHA-256 98315d1de4fbc7e6…

MALICIOUS

PDF

37.6 KB Created: 2020-10-02 07:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7b2ffbbb18b976eef2a804337aeda34d SHA-1: e273d5c91fbbd8d82bda7fa7d95c0b94e0ff7a61 SHA-256: 98315d1de4fbc7e6230e852df6f3203999d65a20b3996fb9a3c1525269bafcc8
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=englisch+indirekte+rede+%25C3%25BCbungen+mit+l%25C3%25B6sungen+pdf In PDF document text
    • http://tasov.jonathanwilliamsonphotography.com/uploads/1/3/0/7/130775519/gojevi.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/76586352630.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/12530548666.pdfIn PDF document text
    • https://site-1039341.mozfiles.com/files/1039341/vonux.pdfIn PDF document text
    • https://site-1038304.mozfiles.com/files/1038304/50609876222.pdfIn PDF document text
    • https://site-1036997.mozfiles.com/files/1036997/teluxodixaw.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/1/0437/8696/1045/files/mezusozizep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/gemusuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6081/7820/files/minecraft_shoes_enchantments.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9709/0967/files/91541587890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1044/9820/files/burn_notice_netflix_australia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7480/5148/files/zumugupesoborasinifobofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6699/7398/files/49639444288.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_off00004fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD3 5780 bytes
SHA-256: 28f48b9d6b1c6258740c02d95eb507db2f2d4b504129d5ec99eaa8377ae35232
font_01_sfnt_off000062da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DA 10952 bytes
SHA-256: 5d240e19f9dd6a11217fecc84c67627602f357e8d3c0237762eecfbc995b4f63