Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c18e93ee437400…

MALICIOUS

PDF

40.8 KB Created: 2020-10-11 16:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d22b581b6d9209d9ec28f295875e52ae SHA-1: 76bfa8d568fd5f736bd191aa1f88641af7b32770 SHA-256: 40c18e93ee4374008cf4465f5326a94c9b534aae5a93396df77bd84e9577eb98
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://cctraff.ru/pify?keyword=fifty+shades+darker+christian+point+of+view+pdf In PDF document text
    • http://files.browexpressionsbycynthia.com/uploads/1/3/1/3/131383754/cebd0df2ab3e17.pdfIn PDF document text
    • http://files.cfbinc.com/uploads/1/3/0/7/130775982/feninexixoges.pdfIn PDF document text
    • http://files.fhkproductions.com/uploads/1/3/1/0/131071249/2496691.pdfIn PDF document text
    • http://zurum.mobile-memorabilia.com/uploads/1/3/0/7/130776271/dumeloge.pdfIn PDF document text
    • http://files.longevitywines.com/uploads/1/3/1/4/131455158/19fad89befa.pdfIn PDF document text
    • http://dujux.coyotegame.com/uploads/1/3/1/3/131383548/807f6cddea195c.pdfIn PDF document text
    • http://files.elliottforrest.com/uploads/1/3/2/8/132815872/bulamolujales_subatuvugarexus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c28f1ad-eba8-499a-92a6-424d223cff5a/ponaruguxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42720172-0faf-4a16-884c-ea74bf4458a9/87261793079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/579e08af-0759-46dd-887c-8c30923dce5f/29595979164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4eb169a-6935-40ee-bcdf-2c47ad6eac1f/25268900003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0973/1483/files/33672781124.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/kent_school_district_substitute_jobs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3195/2536/files/dickinson_county_assessor_page.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2341/4942/files/wopifuxopubivujilurekosus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/1525/4428/files/aiyoku_no_eustia_translation.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_off000060c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C4 5484 bytes
SHA-256: 3da96c41c215416cca61a2986b13aa0720c00b06ae80d1fdf4adad2e7f6153e9
font_01_sfnt_off0000737d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x737D 10120 bytes
SHA-256: 8a1c66c66bf41fd786578db4e25c77f0d76a164bacf0d9e248d94e1c46fe10e0

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