Malicious PDF — malware analysis report

Static analysis result for SHA-256 af20899e68d35b28…

MALICIOUS

PDF

62.1 KB Created: 2020-10-19 17:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 19c5ed072b5a5922743fc45eace48d23 SHA-1: 63a28e928f6e32edbfae03e390637edf943acf66 SHA-256: af20899e68d35b2856523b9203b5b84de204577bc7420d22ad265b47493f10d8
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://ttraff.me/123?keyword=edit+pdf+software+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382186/normal_5f8b5f9c9341e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f8cf086ccebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5f8a555af3ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_5f8ccb36c7e2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5f8d5668e575c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f8cee9369acf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f8cc56f660f2.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/1/0487/0432/3734/files/waxusetibuwejoroto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5542/2369/files/52412688486.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9331/0631/files/que_es_la_distraccion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8188/4329/files/tipos_de_generadores_eolicos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0581/6227/files/nuxafup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8881/7562/files/how_many_calories_are_there_in_a_pint_of_blueberries.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/that_smell_good_shop_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/medieval_leather_armor_patterns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de868e6-e64c-4b03-9e2c-c19dadc80145/59859245464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29838949-0f20-4895-b583-315fb7546694/97333444964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f256b3b-aa1d-4dd1-b670-10a9aeeb58b9/81783383449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0933b6fd-815d-4b5b-9383-5e8624099f75/97179371229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd3ce043-6aec-4406-9653-9d81b0e4e65b/terojigam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9816/8725/files/story_map_graphic_organizer_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4869/7493/files/9068283393.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0395/5360/files/kafobipugofusemut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1673/0799/files/borabutimotumibasimo.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_off0000b615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB615 5084 bytes
SHA-256: f730a2ded8a7ac4397feecb19a630dad011d84c6b853c059c1322822d536539e
font_01_sfnt_off0000c789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC789 10344 bytes
SHA-256: ac7b399aa84b7bb379fbe3645658c7b06636925fd59b7d9435e4755a20476fe8