Malicious PDF — malware analysis report

Static analysis result for SHA-256 86da4dd836dc84aa…

MALICIOUS

PDF

42.1 KB Created: 2020-10-02 00:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9fed56de470ca396dce7d7024db6434c SHA-1: bfe20f0b6707c104e001d41fa16f3c8c307f4e4e SHA-256: 86da4dd836dc84aa4f6e8e483046a0ddb6e98bba236fa0df5df63edc6647c141
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://ggtraff.ru/strik?keyword=arditi+del+popolo+pdf In PDF document text
    • http://xufeloto.mrisar.org/uploads/1/3/1/6/131606490/xoberowenud.pdfIn PDF document text
    • http://files.helenlloydaudio.com/uploads/1/3/0/7/130739883/popigasifuwefujisa.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/1/0461/6444/3299/files/pnc_direct_deposit_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1137/8839/files/felifebazenukapobo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/67846043226.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9129/6413/files/16255625067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda614a4-e63b-4d8b-b20d-8ef50932c0cb/sipizabaxusibelit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19dd212-7d08-4aa7-ab22-c5fd8d99aac0/wajununogiraxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20067889-51d6-4c5c-8e02-13af1b65fb33/danazodebodawozugegefewen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31a63d5-cd17-4ada-8fa5-20508de14cdb/vusafarupemowig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5596a24d-2ee6-4b07-8fb8-a870a339b87f/42622369457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c521a59-2d45-496a-89e1-dab5d588f49b/80425279764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9af5d0-50ae-47a4-b12c-24f6164fb940/6436850356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a07dc0-61fd-4caa-8bf2-d9af28ff6b47/5187599027.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_off000067bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67BF 4636 bytes
SHA-256: 276507582e69571bb19a6f33f8ade1db376495c378d31d462660d9f3562898d2
font_01_sfnt_off00007794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7794 11052 bytes
SHA-256: 0b5a67ac92589dd168a646c056b3a35a91700d2c7d846295f02f2ec6f07c5498

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