Malicious PDF — malware analysis report

Static analysis result for SHA-256 4001a0265fd86f8f…

MALICIOUS

PDF

40.0 KB Created: 2020-10-01 15:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b46849033f3375091b4fc6ef6607eee3 SHA-1: ccfd4290c775c14ddc073f654a72941f96ad8481 SHA-256: 4001a0265fd86f8f10eee36d56cc1aef394b09f12705ba0b98f20635b5c235a4
202 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bioconjugate+techniques+3rd+edition+pdf+download In PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/taruxivew.pdfIn PDF document text
    • https://site-1036713.mozfiles.com/files/1036713/78302089421.pdfIn PDF document text
    • http://files.izenbergs.net/uploads/1/3/1/0/131070212/b588cce2.pdfIn PDF document text
    • http://files.thelearningoptions.co/uploads/1/3/1/3/131380745/3804327.pdfIn PDF document text
    • http://files.hearthfirenordicwares.com/uploads/1/3/1/3/131379256/3e83d.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/1/0437/1228/2789/files/xokikel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6724/7258/files/american_civil_war_cartoons.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6787/4207/files/12997263188.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8379/9459/files/gopakizosaxukigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fc092d-ea38-44e5-8e23-49b1b09f0424/86378256168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8106b97f-dae8-436f-916b-067040477512/65591131454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2c2a0d-1dcc-4b69-8ee3-ca36672e9e39/78893249012.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_off00005b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B32 5924 bytes
SHA-256: 03213846e6af956a4239228d70b4db175c5a47f71da19b7c966f5146d1f8478d
font_01_sfnt_off00006f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F69 10308 bytes
SHA-256: ca284883d5c7b1e018da9f77f05f7dbb949202437ee65fb79310612e040e7490

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