Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6c965a5b88d76d…

MALICIOUS

PDF

41.1 KB Created: 2020-09-09 15:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e4b98e62f709934c782593cc3e9221cc SHA-1: 2683ec3e2ef4b4f2740d7eefb17d04c0753377d4 SHA-256: 9f6c965a5b88d76d5eb0e62567b9be267ddd340da33e6b5473736717d494d556
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://ttraff.com/pify?keyword=keto+bread+recipe+pdf In PDF document text
    • http://miwowef.moravianseminary.org/uploads/1/3/1/3/131379945/634128.pdfIn PDF document text
    • http://files.iremuny.com/uploads/1/3/2/8/132814589/8c9368e520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/81b904_28e764b45e6a4ed49e0e30a474fea0be.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/aef5b7_6fa0d65a261e41089e5e2d5c67e3479c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2c223_4918b31312ad44e191b4a0dbe88730ea.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9663/7597/files/free_easter_flyer_templates_word.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4561/5766/files/hurry_crossword_puzzle_answer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/guia_ceneval_derecho_2019.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/dfb5f8_000424edff6e4d938d4fd11bbbe97e4d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e56fe2_59c329f5d3854860a9361fa8462c46dd.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_off000063db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DB 5048 bytes
SHA-256: eed4eff1e23da64e9e27281d4c17a60d4d8cb826b8895eee5c656d7973a3d56d
font_01_sfnt_off00007517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7517 10292 bytes
SHA-256: 258f5480b0c90ae8c6fd02246d04e79d734526e3deb6143162367068767c4386