Malicious PDF — malware analysis report

Static analysis result for SHA-256 8793e8c8f89db40c…

MALICIOUS

PDF

39.9 KB Created: 2020-10-02 09:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: c74546d534258fc6a81ca471414a05c3 SHA-1: 78362444c593a3ebdf42b3c10faa721158cf7ef1 SHA-256: 8793e8c8f89db40c40c4f7885f93279f6600b9d744095a9ec056fa9f126ad52f
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=professional+event+coordination+2nd In PDF document text
    • http://files.construction-industry-software.co.uk/uploads/1/3/0/7/130740217/90f02.pdfIn PDF document text
    • http://dazit.barringtonmiddleschoolpto.com/uploads/1/3/1/3/131380470/395249.pdfIn PDF document text
    • http://files.yorkstone.ca/uploads/1/3/0/8/130874064/7431978.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/1/0493/1177/6927/files/2003_vw_passat_manual_transmission_fluid_type.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4598/5179/files/92315909198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5492/3925/files/oak_view_middle_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3594/9218/files/leontief_utility_function.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3577/3096/files/jibivuvuvekazitopakun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4242/6017/files/19469105626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126f9108-de9d-4701-891c-9036c6b0c517/vatewobupulimowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4a0c10-a902-40f3-ac6a-bd6ddb66dc15/17240429655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ee17bb-cdd1-40e6-b3a5-8aa97771d052/voxegu.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D30 5208 bytes
SHA-256: ead1aa282a653d77a14a90e5316c40e03d8e2d33f204a1df8f22726904f5f8a9
font_01_sfnt_off00006efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFD 10472 bytes
SHA-256: 26cb564642f52b6e07defd25ec0f21b7d6eb5a1093c7cea2c950e4b18b43a3da

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