Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd78d9c1cd8af07…

MALICIOUS

PDF

50.4 KB Created: 2020-10-08 05:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 51c99d5e9d6598d87c0f68b3af62d1e8 SHA-1: f0c9f5fe5a1534cc999d4299bb438f9f6d1bceb3 SHA-256: ffd78d9c1cd8af070b9ba54b38137f217580fee52cb49bb3e44644cec1d0a25d
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.cc/pify?keyword=lab+rat+worm In PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/39486173706.pdfIn PDF document text
    • https://site-1043158.mozfiles.com/files/1043158/10597985127.pdfIn PDF document text
    • http://files.thelaurawilson.net/uploads/1/3/1/8/131871859/borunalezusi.pdfIn PDF document text
    • http://pivogag.immanuel-on-the-hill.org/uploads/1/3/0/7/130776088/gexozuk.pdfIn PDF document text
    • http://files.mastergardenersmecklenburg.org/uploads/1/3/1/3/131381712/8481163.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/1/0497/8825/6418/files/10275212431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2480/0168/files/55520210680.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3677/3018/files/first_order_half_life_is_expressed_as.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df416aa4-f218-4b6e-8001-e8e13d41ceaf/27771958883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536dee1e-0213-47aa-81b7-481aa4763070/dewovan.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_off00008a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6F 4792 bytes
SHA-256: eeb17486ea700c5552943b3bcb509ada978d40225ef8a9ab586f8209cfcad1c3
font_01_sfnt_off00009abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ABD 10240 bytes
SHA-256: 6bb84fcd9f98918f30667714c83fd99a3aa2297e48d4f3015971189f7ca7b77d