Malicious PDF — malware analysis report

Static analysis result for SHA-256 55490154cd79b813…

MALICIOUS

PDF

44.5 KB Created: 2020-11-07 12:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 0fe7fa763b06916727e1520f4b5f0073 SHA-1: 3cbaebd077d08250454c32e446123acebd1acbc7 SHA-256: 55490154cd79b81397eb6b84ec11e42262393282eb3ccb9981654f845536baf6
154 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.
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://traffking.ru/123?keyword=dark+souls+2+how+to+shield+bash In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5f8df447bb332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390681/normal_5f93f433dd209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5fa5f39302ec5.pdfIn PDF document text
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/jopufinituxixo-bopozotoloruzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451760/normal_5fa667d538cfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5f99cf213ca37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f99a7871175a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://degareke.files.wordpress.com/2020/11/15697771868.pdfIn PDF document text
    • https://futelura.files.wordpress.com/2020/11/fanelem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/594b62e2-b842-4c42-8e27-15601ac62e7b/campbell_biology_11_free_download.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_off00006cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEF 5340 bytes
SHA-256: 0de0a1494f412a560211307e5cf17b416d06dba598bc24848044b60ed3878c10
font_01_sfnt_off00007f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2A 11096 bytes
SHA-256: 3fae40d8204f5767bb2f532e83243443940b320247d63a381e0141b77b3308db