Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a1d72209227170…

MALICIOUS

PDF

39.7 KB Created: 2020-10-04 04:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e99548b3f6c81e98dcec84d473f3b4ff SHA-1: a5df049f8f7e9c9841ac670fbb73257857e8edf7 SHA-256: b9a1d72209227170bc97b9d045e8f2d3adf1a8b5ec1b34b0e4082a19e60bd74d
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=pathfinder+planar+adventures+pdf+4chan In PDF document text
    • http://gazitoxek.richfeenstra.com/uploads/1/3/1/4/131454215/soxewedulu_xunoromurato.pdfIn PDF document text
    • http://godosex.redhoglures.com/uploads/1/3/1/3/131379121/tavopotufopetunoxu.pdfIn PDF document text
    • http://faredife.talklife.com/uploads/1/3/1/4/131411688/f50e82b3554d24.pdfIn PDF document text
    • http://files.theparksphysie.com/uploads/1/3/1/3/131380601/gunemifoj.pdfIn PDF document text
    • http://files.cuestacollegerodeo.com/uploads/1/3/1/3/131383621/zeweruvodunewekeribe.pdfIn PDF document text
    • http://labofukij.vashonislandquiltguild.net/uploads/1/3/1/4/131483372/luxikizuwomemegotage.pdfIn PDF document text
    • http://sosiguput.mollyquinnart.com/uploads/1/3/1/4/131453723/41344bf.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/1/0437/1765/6731/files/53694005475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6065/7817/files/unitedhealthcare_community_plan_az_appeal_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6725/2641/files/gpskevin_trans_america_trail.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4110/7353/files/29535401362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2465/8844/files/31325078030.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_off00005d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0A 5392 bytes
SHA-256: 1b5be5ebe000fb414d90c3e994db8d4eb71e93cd3851f0999d694b15e1754571
font_01_sfnt_off00006f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6D 10236 bytes
SHA-256: 5d06157b4c895517d15709263347952fc381fdf0f6ae18a9eae22753fe0770e1