Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9a999e794c0bcd…

MALICIOUS

PDF

38.7 KB Created: 2020-09-30 01:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5d3bada7f20d0fa507d3992dc08d6a87 SHA-1: 39deb22be63dacc74681164ed2dfbbd926e1365f SHA-256: 8e9a999e794c0bcd51edcfa08cd7892cf501557c9fa37eb0159f092a5538f32c
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=balancing+chemical+equations+game+pdf In PDF document text
    • http://levemexe.colorsandspice.com/uploads/1/3/1/4/131452838/8855996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/15293858698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/13881826874.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/gofuvijifod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60233972239.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2521/0263/files/90495748510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf465eb8-f112-40a9-b2d8-659383b0b15f/23090896388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba7c5f7-ee9b-405d-b73f-13264a4198dd/27669698382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a200b1f-c525-4925-a241-1f4256013dbe/71191472906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4a9093-bb9c-4f25-92a8-21210e946f4b/8266274827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9444/9055/files/cfb_boiler_basic_design_operation_and_maintenance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7709/8902/files/posusorudewewatuvaladexe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A0B 5532 bytes
SHA-256: 594894a9ee33253ddd655c9e02c3297212611e82eaf974c815d763e6a1e575a5
font_01_sfnt_off00005ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA6 10352 bytes
SHA-256: c4224838948f6dbd662037ebba7b40a7ba091c9442d7d520032cecf2d11f3ea0
font_02_sfnt_off00008002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8002 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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