Malicious PDF — malware analysis report

Static analysis result for SHA-256 19527d7a8bdaed69…

MALICIOUS

PDF

41.7 KB Created: 2020-10-16 22:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ca5d7eee6865e64e7f19f41eee416e86 SHA-1: 74b08d589c6fd85891e44eaf809dcb419ee168cb SHA-256: 19527d7a8bdaed695a6e6a1febe20f0823ce25212e4790c983295f0e96e18ce1
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://gettraff.ru/123?keyword=firebird+oil+boilers+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f882320f2269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5f89bbe57db76.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/1/0431/1751/0818/files/19875967248.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3230/4552/files/88870593058.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9114/4088/files/talking_tom_and_ben_news_mod_apk_revdl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764f2944-859f-43af-a456-c4df7f3b0af5/2076011874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/310075ec-4b1d-49c2-8630-45bc536ce675/tizaverelireluligisafevav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f90228f-b1c6-4608-9c15-6e18e8fdc970/37640974405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92953eb-451c-466a-9f09-47127846880a/92563146249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/295e7520-9641-418e-82dc-53d39b1f2068/46396890382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81051eb-c511-4d7e-b350-cc4deb5faf3d/logomaxitopupowonexoput.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1859/8038/files/vasuvuxexalidafugubilub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/the_apple_1980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4375/7985/files/ffx_strength_sphere_bribe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8586/6177/files/58359781760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4982d047-d7bf-45c6-8e95-a78e7504f1ae/zatalowuzozeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f68a1ed8-7c23-4cae-9c75-a52c9188f4a0/72104909353.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_off00006616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6616 5064 bytes
SHA-256: 72797df1a46bd42c520d9b125607c45902c0e11465722b15e76dc601d6a12774
font_01_sfnt_off00007724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7724 10272 bytes
SHA-256: 4caab0ba349a45e191e7a1ed11a5ccdef2b87ac1c621e0fcf9e0989030a15330

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