Malicious PDF — malware analysis report

Static analysis result for SHA-256 774d5e76bdae16d8…

MALICIOUS

PDF

41.8 KB Created: 2020-10-03 03:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 32078344e511bdc95408373c68aee2af SHA-1: e44fb797177103832c48dcf2bd5f8127feb95c6e SHA-256: 774d5e76bdae16d880311e9b24476ca8b471e75b1714a89ac4bd53d459ad8033
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/strik?keyword=principles+of+auditing In PDF document text
    • https://site-1036629.mozfiles.com/files/1036629/favumowadiduvali.pdfIn PDF document text
    • https://site-1042016.mozfiles.com/files/1042016/jowubewuk.pdfIn PDF document text
    • https://site-1037172.mozfiles.com/files/1037172/sizeponinuteweze.pdfIn PDF document text
    • http://goleseto.christaevansheath.com/uploads/1/3/1/3/131384635/wupumus.pdfIn PDF document text
    • http://files.salmoncine.com/uploads/1/3/0/9/130969973/8b3f96a634.pdfIn PDF document text
    • http://ronimu.calhounmiddleschoolband.com/uploads/1/3/0/8/130814761/afd4da4.pdfIn PDF document text
    • http://files.nationalartsclubaustralia.org/uploads/1/3/0/7/130739103/fogurilup.pdfIn PDF document text
    • http://files.mobadjacent.com/uploads/1/3/2/6/132680789/6477117.pdfIn PDF document text
    • https://site-1037176.mozfiles.com/files/1037176/82196629266.pdfIn PDF document text
    • https://site-1036902.mozfiles.com/files/1036902/7510603686.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/1/0431/6073/1803/files/perfect_progressive_tense_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0133/1364/files/90049604647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6412/3814/files/rolukokatopopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1874/3719/files/freedom_cochlear_implant.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_off00006438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6438 5324 bytes
SHA-256: 414112e60d4fc7074c3c6d984d9b2a9f440dfdef62a5a53e3e5369a080160fd7
font_01_sfnt_off00007663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7663 10548 bytes
SHA-256: dc2e1e0f6f45393a37467bc1c0b416433650c9d2d4f7c6c381bf25e34405847f