Malicious PDF — malware analysis report

Static analysis result for SHA-256 939667ecbd1da843…

MALICIOUS

PDF

33.4 KB Created: 2020-10-04 04:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c8361d2ebe5bd36f6f770ac46a6056a3 SHA-1: e921b5679d97de370d6ba3e790b73dfefcc0daea SHA-256: 939667ecbd1da843700bb7b1af7965ecbcedb928d3f988da16212ab914d3b76e
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=biomagnetismo+dr+goiz+pdf In PDF document text
    • https://site-1039508.mozfiles.com/files/1039508/wujam.pdfIn PDF document text
    • https://site-1036814.mozfiles.com/files/1036814/kadozirate.pdfIn PDF document text
    • https://site-1041091.mozfiles.com/files/1041091/morutupoluligifosiz.pdfIn PDF document text
    • https://site-1038952.mozfiles.com/files/1038952/xerobifizejujuzobafibafaf.pdfIn PDF document text
    • https://site-1039149.mozfiles.com/files/1039149/dupefemovosejatonotipiri.pdfIn PDF document text
    • http://raxipugot.kitakoreatour.com/uploads/1/3/0/7/130776330/86f942b0.pdfIn PDF document text
    • http://donalonu.deborahvandelden.com/uploads/1/3/1/4/131407572/zowolawo.pdfIn PDF document text
    • http://vexepi.standardpoodleforsale.com/uploads/1/3/0/7/130776486/mazugijado-liten-zugaj-zozuxadifuj.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/1/0437/2725/7749/files/16850783364.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/6485/6228/files/26586418338.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/2758/6213/files/xuxederapag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6073/2316/files/91882978496.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9218/1145/files/oregon_manual_chainsaw_sharpener_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c788143-37b3-4a84-b67a-058f6993db83/vukukobotaxaken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b8817a-36ec-40ff-a88d-8f6280273c6c/zedirusulunon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4d078e-d23c-4fa8-a02f-7a3fcf5bfcb7/61412606749.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_off0000466f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x466F 5428 bytes
SHA-256: 567712f16532c17c62e1b656a7ebb6c48655f96312b14738a635882781a1d31e
font_01_sfnt_off000058da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58DA 9500 bytes
SHA-256: 773098b9954dc2f1d254224579ee59c2e0b27fd266778b9c09c2cf6eb393af95

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