Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a3a2f3a0a0e8e1…

MALICIOUS

PDF

44.8 KB Created: 2020-10-30 04:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: aaa2580cecd4156ae279dde611926391 SHA-1: 91463a48aec8660ef2481d5525ea32a816f1ce0c SHA-256: 40a3a2f3a0a0e8e1cc4b7c617174941d8ce60dbc9ac64036222775d5a92eff67
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary lure appears to be related to election results, directing users to a URL that likely serves a malicious payload. The ML classifier also strongly flagged this PDF as malicious.

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.club/123?keyword=columbia+county+election+results+2018 In PDF document text
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/3041098.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/3911336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_5f89f3b91f9a8.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.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/sugaguxagu/68247803571.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/rogege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fde056-554f-4216-957d-08972b08711e/hunter_x_hunter_uvogin.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/wegekezefefowox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2412/1495/files/continuous_casting_refractories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9c922b-dfa2-4054-9498-e2b9052bb19a/43168166958.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/allen_bradley_rslogix_5000.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/start_high_school_twitter.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_off00006c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 5612 bytes
SHA-256: f48228d6df9f058ba1badec8bc0d564ab75a62496c1ce1269966d381bf9470d3
font_01_sfnt_off00007f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4C 11792 bytes
SHA-256: 3f5c96b755158d5a6e4746d52a3a09a3fe30f510d2cc86767a27b4e116f87598

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