Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59805590162a695…

MALICIOUS

PDF

39.8 KB Created: 2020-11-01 18:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3b90c33efd2f7c81ce01c7ccca15c292 SHA-1: dcd07d55eaa3390a37c12b3049e5bf3195e81ef0 SHA-256: f59805590162a695f2aa80ad85fe8d6d9592205e85d860cf0ce5c39e3d1a965e
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/strik?keyword=welcome+back+to+school+letters+to+staff In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5f9417f5b0761.pdfIn PDF document text
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/lodikezimad_xezodosidela_noruxujivine.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/7d93b6ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_5f930ed3a0d30.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/tisoxoloragen.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/jukoxisojow/learn_algerian_arabic.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/gepam.pdfIn PDF document text
    • https://s3.amazonaws.com/mewezekilafef/47483972716.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/frontline_plus_for_puppies_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/fibuboxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9896c780-1ffa-4855-8ca1-d25bf284f75c/gatug.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC5 5340 bytes
SHA-256: fc357d560cf1e68c1d2261059a4f200632c8f721fb79149c3bac31ff78637f53
font_01_sfnt_off000070cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70CF 9844 bytes
SHA-256: c00aabd9ce18a6c61283c9e8c911dd70f23faee7225c8b09baa9cf7cd1ee83c8

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