Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecd42dda901ecd3…

MALICIOUS

PDF

41.1 KB Created: 2020-10-31 05:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: dc2243c971c229e1b0f2af0acfa01f31 SHA-1: 210740e6b86d575ced21fa3528346025558c868d SHA-256: 4ecd42dda901ecd3f8b4baa22412bf8beea52c6178db11100d268c1abbe7b032
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://ttraff.me/123?keyword=plant+physiology+textbook In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5f8bc82e03e9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5f8afc35a5f2e.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/fc74d9089574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416798/normal_5f9be4e6874e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_5f9793f15d522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f9cd0f98f2c7.pdfIn PDF document text
    • https://jawogebewo.weebly.com/uploads/1/3/4/3/134369376/b197d9609ef25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_5f92d40453be0.pdfIn PDF document text
    • https://welerenumabo.weebly.com/uploads/1/3/4/4/134467224/gufenegovubexovele.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/5088d017-7ba5-4be0-967e-dd5c03e6ce4d/rubifiwiparewonap.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_off000060b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B1 5360 bytes
SHA-256: d5c58e3e3b14b03e1897e323b2ae054e0dd775edea4fb3439c83d4bd06c7e936
font_01_sfnt_off000072f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72F8 10880 bytes
SHA-256: afbaa2252019bd73f74c5d162256b9977942aa536eaa37524671a3ea379342cc