Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf97085777636207…

MALICIOUS

PDF

45.1 KB Created: 2020-10-01 05:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b37bb326228ee50ba53779bf1d1fad6a SHA-1: 67e482ff9b7c87268d96b0e24c86a46dfccc88ca SHA-256: cf970857776362077d5e7498fa02ca8a2ce17e6baaaac43292285b676dc20995
234 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=power+cable+size+calculation+formula+pdf In PDF document text
    • http://files.thetransgenderliteratureproject.com/uploads/1/3/1/1/131163632/8988343.pdfIn PDF document text
    • http://files.lihmsisters.org/uploads/1/3/0/9/130969695/muvovexese_teguvozafawiwej.pdfIn PDF document text
    • http://dukapivaf.mumsweardaily.com/uploads/1/3/1/3/131398430/f10a2d6ef5f131.pdfIn PDF document text
    • http://jalonati.walloandlily.com/uploads/1/3/1/4/131452977/1229612.pdfIn PDF document text
    • http://tumeb.teamnewall.com/uploads/1/3/1/6/131637254/rilidefavon.pdfIn PDF document text
    • https://site-1037081.mozfiles.com/files/1037081/76060349186.pdfIn PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/94302095758.pdfIn PDF document text
    • https://site-1038790.mozfiles.com/files/1038790/tuzifapuberim.pdfIn PDF document text
    • https://site-1036879.mozfiles.com/files/1036879/nunaxojogigojijuno.pdfIn PDF document text
    • https://site-1037886.mozfiles.com/files/1037886/85160077566.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/1/0430/9804/6621/files/61823019367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9696/5269/files/derejijetutali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0902/7735/files/80436266209.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0542/5310/files/30754195051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/dufokakovoviriru.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_off0000691e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x691E 5584 bytes
SHA-256: 4ef915501c28aa0fcac2f8159a010d59d5c227a76749f424ee5054faee6f0eb8
font_01_sfnt_off00007c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1D 13680 bytes
SHA-256: fb2212b1c3fbcedf12a669d0fd5945a93753bc59489e408fcf46e440ea7fee9d

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