Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad619fcfdbc92f0d…

MALICIOUS

PDF

45.6 KB Created: 2020-10-17 05:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 912327b799f0370bcd0d317f2ea3fbd6 SHA-1: 80dcf55505f1808267bd46d970af028bea67ed4e SHA-256: ad619fcfdbc92f0d4ee15d8b7e2759a893a1786cecf7b698dc75eadc3cd5624e
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=evaluating+author%2527s+argument+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f8a3de8ce837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f89f21d44268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f8a34f9e2f7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5f87f4f75efa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f8a510786407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f89cf1fddff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f89770da2213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5f8a2ae392e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375699/normal_5f89f7b11ed11.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/1/0496/0482/1144/files/28344129571.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/free_four_seasons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5cbb9a-56db-476e-9c34-eaf9af615478/96694923236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d429b5-5b66-47e7-b634-a4674dd96ddc/62319207606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6249c660-b8e6-4180-8ded-7757d4526aad/76199585462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4209efa9-128f-4a3b-b676-ac9150d83302/rokutaliremowokivuvon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5ecd35-e945-4e29-8001-f9808c96877b/rozapuzadulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8389e8-ff3c-4cf1-9fbf-e340ae2ce71b/mofanoruwerila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0b63bc-8574-4748-b0b7-3982a61bd5f0/ruzopokesexobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5319f15-beca-44b4-b96c-3fb4343752b4/60629179729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b899cefb-01dc-460a-9d5f-3b8a2463f2c2/46891624561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e294fe-6a0d-4239-9dd7-73491e0b0aad/bejiz.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_off0000750a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x750A 5304 bytes
SHA-256: b77d22e2c4ac8e4650b94799a5f8d2055ed8afbd8be16a8ef017ebb2898d18b6
font_01_sfnt_off00008707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8707 9816 bytes
SHA-256: 9075a09d0dba7b6899d9b20f093a37ece086b97f340263af972316d1bd18799f

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