Malicious PDF — malware analysis report

Static analysis result for SHA-256 857a96674c1bf7bc…

MALICIOUS

PDF

39.4 KB Created: 2020-10-09 19:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 6b0c696948f096e5b63f361540dc79fb SHA-1: 6811830000dcebe11aa69bf3d24a8d840f63d985 SHA-256: 857a96674c1bf7bcc4de09fd441fb007281cf45e5ebaaa0da093752ca13c5eed
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/strik?keyword=warrior+of+the+light+pdf In PDF document text
    • https://site-1039547.mozfiles.com/files/1039547/50151756782.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/55977813304.pdfIn PDF document text
    • https://site-1044161.mozfiles.com/files/1044161/43234005642.pdfIn PDF document text
    • http://jasijuro.sdstarresources.org/uploads/1/3/1/0/131071231/3787688.pdfIn PDF document text
    • http://files.bugeyed.net/uploads/1/3/0/7/130740142/b4600d4bb9e40.pdfIn PDF document text
    • http://jixosak.kansascitywriters.com/uploads/1/3/0/7/130738706/8241048.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/1/0495/9184/5016/files/zotibefelifu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/14754801081.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4329/9234/files/levoparotosadanu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1132/6119/files/yin_r._2003._case_study_research_design_and_methods.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_off00005bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF1 5140 bytes
SHA-256: 3be5d71c35a6ca149085eb4a1a72e95287c4eac433a1d0a84ffe075d3bdf6a14
font_01_sfnt_off00006d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D78 10484 bytes
SHA-256: e270c20d529cc85f851ff95997ff87856567edb3b201f7cde81a799388eda16d