Malicious PDF — malware analysis report

Static analysis result for SHA-256 c776ae05895790fd…

MALICIOUS

PDF

42.6 KB Created: 2020-11-05 12:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: b8aa8d12b02e89810b030f2329678b66 SHA-1: e06b59e6471a6784d7371e18633f725c28fe4c40 SHA-256: c776ae05895790fd87ed757db1faf9a7af0a01ebe440e3879289e8480ac5bf3c
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/123?keyword=8k+ultra+hd+video+player In PDF document text
    • https://nejalebemenogun.weebly.com/uploads/1/3/1/0/131070187/0852a936b47b69a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_5f9d9f019a429.pdfIn PDF document text
    • https://dabikosetizoje.weebly.com/uploads/1/3/4/2/134234987/649692.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/310218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_5fa1e02371087.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/pizexopenaxu/misozagalu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/cursive_quotes_of_the_week.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/95118293677.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/ap_human_geography_chapter_5.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/94803731614.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/61398243998.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/logerujij.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_off000068d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D0 5192 bytes
SHA-256: a82e27d4bb6843f531b7f810b31febfa910768615dee636146e2ddee772b60e0
font_01_sfnt_off00007a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A83 10420 bytes
SHA-256: 6eda464761c708c55c647066971272a62ee8a8c7781db2464b677ac1335649e6