Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1d7dfec3a3a9e3…

MALICIOUS

PDF

34.6 KB Created: 2020-10-04 13:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 754cb9611cb4282625d9f3da2419cec7 SHA-1: ec4745b8db786c07d41e04754b8ba05e2cd5774f SHA-256: 7c1d7dfec3a3a9e30fdfd9ebdf9c441f382e88df27c040c3f23e0eaf470e610e
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=rock+cycle+worksheet+ks2 In PDF document text
    • http://kinal.stevicosta.com/uploads/1/3/2/6/132682076/b688c91fe.pdfIn PDF document text
    • http://zumol.wrprovince.org.uk/uploads/1/3/2/6/132681611/1d28afd841a62.pdfIn PDF document text
    • http://files.ct-200.com/uploads/1/3/0/7/130775195/mutikasiwovaso.pdfIn PDF document text
    • http://begadebak.johnnyallentennisacademy.com/uploads/1/3/0/7/130738848/1871369.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce843ce4-998a-456a-a312-a27661bc4381/fadafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c7ad8a-aed8-4b1a-b820-73c4537a23cf/jifopogowuparamagomike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4424ce9e-e1e2-458f-8c24-a8023db9b4cf/91694222758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad628d1-3e10-48b0-8438-cdddddae4c05/zixadepagorigokivixobiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b1d66c1-037f-4d5e-a193-0c3a141e6de5/28265856034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf855a3-bb81-4254-98c8-3edde19163c8/3556515565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc42823b-5c19-439f-ab85-9584e4ac16a0/41774891756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33561b1-0981-490c-b017-eccc0ea71aeb/nezibukukog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/045fcfcb-f083-4728-94a9-a92ff80e2024/57319972966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/218bdc25-5273-4fac-8b38-ba40fd75cb5a/14933490652.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_off00004c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C79 5072 bytes
SHA-256: c129a1657ab9b33e943870b3ba7e6370b9aa780a61aff12db8e7bf9c0e2e76d8
font_01_sfnt_off00005dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDA 9332 bytes
SHA-256: 8863d55fe558ab4b9faad23a080f71de8d165d60669fad0fcbaea2b25cb2d380

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