Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db0c84b9bba31e5…

MALICIOUS

PDF

54.2 KB Created: 2020-10-15 17:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 2eafba1cefec848e6856c45373d661ee SHA-1: b13f21022bb6b9f2b147f82d010644db8ca47734 SHA-256: 8db0c84b9bba31e57169eeb91039307c134a0968e2ea24a6c73d6167bb75eece
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=pronouns+and+antecedents+worksheets+6th+grade In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f873c41551b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f875e59c4d5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f87ca8e696b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f870df784df2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f8816391e804.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/dafujivilisig-jajetux.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/8721e85a3c0b994.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/1/0430/5115/5618/files/bailes_populares_en_bolivia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3500/2533/files/tolofigawoxasotoxetigasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3059/9064/files/grand_forks_central_high_school_football_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/18247742871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d2e5ac-d61a-46c6-ab96-702efdf03851/nebaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aaf931e-3984-41b3-9ceb-088e0bedf168/72951709968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358a00a7-67e6-4ab9-b51c-c5af800dfd66/sasonitemevanagexafigik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03107e73-6d77-4b18-811a-e2dab5f6d33b/10875097907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70836114-4c6d-4424-be69-b177c999cbb9/95375565056.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_off0000874a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874A 2828 bytes
SHA-256: 3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec
font_01_sfnt_off00009145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9145 5480 bytes
SHA-256: 9cfda90cd8bc6efd90aadda5e9ad1ca002aa20c3813d0309a617a8648665ab79
font_02_sfnt_off0000a3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3F4 12128 bytes
SHA-256: 9a981622bac6979d1939a363eed099ad1ad54841da27226e2a41a039d6b1b627

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