Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfca758a8e4d24a…

MALICIOUS

PDF

43.1 KB Created: 2020-11-07 00:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 0b790f863715d5b60eb8cbe0ba2f16e2 SHA-1: ef529069c210fa9bdc254e0849364a64b0bb7d1b SHA-256: 9dfca758a8e4d24a4b32b3d9ac5616f93b11146735bd65ad083f258762555d65
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://traffking.ru/123?keyword=classic+tailoring+guide+wow In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5fa3547c4924f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f9e1b401e5a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5f9cebcfc93e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_5f9151284b2fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_5f9c960901936.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/anti_stress_coloring_book_free.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/kenwood_excelon_x303_manual.pdfIn PDF document text
    • https://gukoxawe.files.wordpress.com/2020/11/35097490628.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/about_india_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/jiwejazifudetudi.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/wifukokap.pdfIn PDF document text
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.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_off00006970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6970 5104 bytes
SHA-256: b50a6f597a1c6a6e03076ad3eec5af89525b5af99db50cb61abe7d89c2575661
font_01_sfnt_off00007ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE0 10704 bytes
SHA-256: 4d3f1a99ae1764d7ca34603864a59bb7839f91b7b1c411bb8b3dd40fff4c1421