Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9436b51f836a46…

MALICIOUS

PDF

36.9 KB Created: 2020-10-16 07:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 8fdc487d39e1f305cfd4ec16f3c275f0 SHA-1: 7295fb06df3a5273d0f635b3aa6faba5b2999f8c SHA-256: 5d9436b51f836a46abd5cde12c70f51b48d52eba8232dff8ee2596a368a85489
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://ggtraff.ru/123?keyword=oxygen+not+included+bathroom+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f87e9fc3bfb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f889606dd114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f8922e031cf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f8789d354a55.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9031774.pdfIn PDF document text
    • https://bigogewoxof.weebly.com/uploads/1/3/0/7/130739615/femoxazuji.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lonevu.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/1/0438/2703/6322/files/amanda_bobby_cooper_twitter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1976/2855/files/67336736003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1861/6473/files/desilabokunejoxuxen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9629b612-8b84-49a4-bb4d-e367a743385e/tixibelule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32c6828-49e5-4044-9577-f76df6d4d5b6/13988389470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c983f4-1a90-4906-b6dc-1769ca9fbfbf/biwazod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dbc0b22-ed0d-49b1-abfe-ad2c83c662fe/80889332464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d0ac49-fa16-4958-943a-203de4ec5167/jifadigopegumemu.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_off0000525d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x525D 5512 bytes
SHA-256: 91f29cacc364acee250da61b201b2bb3ac529a3aed5a6b234d6525496623ab60
font_01_sfnt_off000064ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EC 9880 bytes
SHA-256: a2023d9e73e231082984400f681abcbb1a9bce97b712d7cbd9be844f06102db5

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