Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78b9d24fc19998a…

MALICIOUS

PDF

42.1 KB Created: 2020-09-13 09:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2f6f398042526a3bc04bdd91085b52b8 SHA-1: 2685fe34d20689adcda3710c83d402741b8022a6 SHA-256: d78b9d24fc19998aa14708cbeb96672aab66c1ef7d948d69a2aa3b45a02877db
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.cc/wix?keyword=chicken+fajita+tortilla+soup+rachael+ray In PDF document text
    • http://files.dmrproductions.online/uploads/1/3/0/7/130776041/fixanukudefelatol.pdfIn PDF document text
    • http://files.stayhererentals.com/uploads/1/3/0/9/130969352/491d27eeb560d5.pdfIn PDF document text
    • http://kupalu.animalvetfairfield.com/uploads/1/3/0/7/130776760/buleto-zegozelonuxikir-netagu-menakobowus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/models_of_language_acquisition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4004/7253/files/sofivas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0549/9801/files/judetexetojux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9927/3896/files/39676767023.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0542/3253/files/danovegukowuxukumope.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2448/1431/files/abertura_inglesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5533/0966/files/organic_molecules_webquest_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58FD 5252 bytes
SHA-256: 4e6050ad22927b49312423295a71d61c8ab445cf89d6088d8490433d5dcd8690
font_01_sfnt_off00006ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD6 10040 bytes
SHA-256: 03a08b7e5bea5373c19f93ba6fffc04f7160997f8baff760d6bf1d7e21d4412b
font_02_sfnt_off00008d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D39 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c