Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe3b50883e6aef8…

MALICIOUS

PDF

42.9 KB Created: 2020-11-03 08:09:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2e384281f4a640e06f7bb8bd954986b1 SHA-1: ad3995724b14358d20f68fbaeac3af2bf76f596a SHA-256: 5fe3b50883e6aef82c8c2fd483c482856957dc7879018c6c56277935bdaf9adf
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=author+s+perspective+def In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_5f8f09606fbf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5f8d6f90150b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_5f9fcc282b6a3.pdfIn PDF document text
    • https://zejaxosadakawur.weebly.com/uploads/1/3/4/3/134372542/9018188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_5f9604586ebb1.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/zupotufa.pdfIn PDF document text
    • https://loraxero.weebly.com/uploads/1/3/4/3/134332649/narulekomiruri-maviwegawanu-naxojus-mikive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5f8d6f0509114.pdfIn PDF document text
    • https://bulavanu.weebly.com/uploads/1/3/4/3/134341337/zikisofetufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5f90bdbed355a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_5f9dd7bf3a87f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_5f9b1ac4abe77.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/lorifumofelu/laxajik.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_off00006a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A78 5052 bytes
SHA-256: 022ada3ec40fb6ccd49cff1714742281b40b6e7c6f60196b24e6c96a90657688
font_01_sfnt_off00007bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB1 10664 bytes
SHA-256: ee82978942e2ea56bcb68a826f9e72bd9824e2bb2bbc0c013c9e104328acf167