Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7468e9f21fb02f…

MALICIOUS

PDF

38.4 KB Created: 2020-10-11 11:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f81183571086dec78237e1d634db72cf SHA-1: 282bfe72c1ef79b249e568a78f82a245aff29f16 SHA-256: 8c7468e9f21fb02fc62c9bfaf3e31d2b9fb7649d75682e6585bc343b55703cd7
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?keyword=the+fast+metabolism+diet+cookbook+pd In PDF document text
    • http://files.icelandlongisland.com/uploads/1/3/2/3/132303079/tejikokowibojo.pdfIn PDF document text
    • http://files.backcountrywinery.com/uploads/1/3/1/8/131871984/7204405.pdfIn PDF document text
    • http://files.jimblackburninfo.com/uploads/1/3/1/6/131606159/395688.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/1/0484/8887/4146/files/ligupefowozunimodozem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1027/7025/files/dd_5e_hunters_bane.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/5281/0659/files/98033357029.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/45265109903.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7988/3170/files/gabajuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2707/8052/files/masopesegovipel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/jefer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bcffae-3485-4180-a6af-231f08d72025/fetoxonibiwadopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d71545d3-624a-4d07-98c1-b069991c3042/dimobaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1918ecfe-e46f-4f21-ad80-1657d34e9258/wolamisezijelikubefujaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b0cacc0-fc20-4d5f-ad18-d23338b2f5d1/61148557216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063c122b-907b-41b7-807d-3f3c56abc636/27351009893.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_off0000576d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x576D 5452 bytes
SHA-256: 5beae8a43cdd50d2d71008660bbca4e1eae7e4b87586e129cd7b78fd413d4ba0
font_01_sfnt_off000069d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D0 10272 bytes
SHA-256: 18940d625bb48f1a84923aa026d302d938f17f2e697bfa18210ebf135abe93c3

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