Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed8a5723352dd0c…

MALICIOUS

PDF

51.2 KB Created: 2020-10-06 09:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: dad831aa9f5f9f3c78fd68a707c8ee2f SHA-1: 32e78bf51d192d8b79ba6ce654d76013e56acc3f SHA-256: 9ed8a5723352dd0cfa3870c0442cf229bb9b682c4253661ee4c0a4773517861a
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=yahama+ysp+1100 In PDF document text
    • http://files.gracesnh.com/uploads/1/3/2/7/132740228/3736866.pdfIn PDF document text
    • http://files.hazelrosegibson.com/uploads/1/3/2/3/132302883/ragis_gemagopudawevo.pdfIn PDF document text
    • http://files.peaceplanetjournal.com/uploads/1/3/0/7/130740090/momifoz.pdfIn PDF document text
    • http://files.merakicowithlove.com/uploads/1/3/1/0/131070327/wivewotupataju-satupakedav-tewegagi.pdfIn PDF document text
    • http://sulerudip.biohaircarethailand.com/uploads/1/3/1/0/131070491/mogodu_dafokatekisofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e32693-0687-4de6-9a46-8ef877b16f1d/mejedifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6846861c-4d2f-4e4b-bbf3-1cc3037829f8/25202183954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0d75e0-39b8-4461-a5c5-e32a97955456/netuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8629f74f-6874-48fb-b622-d2f574ae4874/63898757567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50fa331-3496-4178-b82e-2cb9fad48c63/84159000433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b40b8a1-853d-45e7-b5aa-00938e83f438/gusefiwuzavuvabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/jumawekaxuvaxal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6869/4943/files/mean_median_mode_range_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/understanding_your_paycheck_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75D7 5188 bytes
SHA-256: 316d2a25bf5c53053569b45e57aa9b90818a94a28f0a527b7d0522f79e975c6d
font_01_sfnt_off0000876b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x876B 10292 bytes
SHA-256: 1780d3d89e1665b027ecd9893f83cc6f7b383be65e0d1c976671bd94bcd9f71e
font_02_sfnt_off0000aafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAFC 16172 bytes
SHA-256: 43f81ad28a11754f918e1a8506204f4828fd55c141429c527ebd1aeac4287a79

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