Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d528113651fd8fc…

MALICIOUS

PDF

44.5 KB Created: 2020-10-14 15:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9951734b247372697e43d8f458b35ab8 SHA-1: 32cab68a2054507b7bc2586b7869c84870bb8e26 SHA-256: 4d528113651fd8fcb77c520a33753dd6687a0ff70fe33b672e85b9430eca0e8f
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://gettraff.ru/strik?keyword=android+exclude+from+recents In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f86f50735357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f86f47b5c688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f86f465ad09a.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/1/0431/9238/5700/files/dbt_skills_handouts_emotion_regulation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1447/3886/files/canelo_fight_stream_online_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6286/0197/files/30583683383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6503/4902/files/description_in_spanish_language.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/mass_license_renewal_requirements.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7437/9173/files/40145264387.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5879/7471/files/rotutaremazovepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8402/9845/files/hollenbeck_middle_school_missouri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3768/5920/files/the_sims_mobile_hack_tool_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3c0d31-69f6-42ae-875b-40a620bfafc5/zitopasosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa0eea0-820b-4a53-b4d6-438e45c625da/zalivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d52d03-9298-4301-9526-e224395059f5/xarimesubikarez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ce3151-124f-45f2-8a82-682e7220e764/35775574141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1767043-cf39-4bd3-b328-c55a14c36de4/88614165874.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_off0000701b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x701B 5016 bytes
SHA-256: 915638a71a6ef374e0013eba412e0c415530758506eec42a96b3375296a8f9b4
font_01_sfnt_off00008111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8111 10512 bytes
SHA-256: 1acc3ca3df14f7ca9777a8bba2a11ad534a18b8c6efa90340e444552b655a4a9

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