Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c43db0788d3b5bb…

MALICIOUS

PDF

43.0 KB Created: 2020-09-10 03:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 980c549e4007f8c753b1f4bae8a41889 SHA-1: eada681dcde00a79eabf41a6ebce74eeb93985f2 SHA-256: 4c43db0788d3b5bba0407b33173259ede16e36efac35ed29207975119330dbbb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with the heuristic findings. The primary attack pattern appears to be SEO poisoning or a phishing lure through a link farm.

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/wix?keyword=canon+edsdk+3.+6.+1 In PDF document text
    • http://files.lisalightfootgallery.com/uploads/1/3/1/6/131637853/lipatovomivepifukura.pdfIn PDF document text
    • http://vuwasar.wendycooneylightingdesign.com/uploads/1/3/1/4/131438110/2893348.pdfIn PDF document text
    • http://files.freetodreamvacay.com/uploads/1/3/1/0/131070500/ec6e6fd.pdfIn PDF document text
    • http://faroz.wellswindowsanddoors.com/uploads/1/3/0/7/130775432/modomos-dafatejetawedi-pasiwulunitipat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/e56fe2_e121512761c542aab3ebe0263c2d8a2f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8d46c2_81e0feeddcdf47dcb6f0c39c29f4a30c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/full_bodybuilding_program.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/8740702860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8611/0110/files/medical_terminology_suffixes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8544/6824/files/90582802408.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3ab5ed_b8ddbd8d8f794cebae2453589c6d35f8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5926b4_70f894db090a4789ad87c894306baaa8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/70094d_5fe2352379004de28e195ee07784a9f8.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_off000060b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B0 5060 bytes
SHA-256: fd7660eab082d66100ff2c9b4700aacf2b15ecf68b72284319d2735da697dafc
font_01_sfnt_off000071fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71FE 14948 bytes
SHA-256: e30e047f69f258e7dfd82ae628bc81ced93d17ee71625a2446f78ca7cd4da9f3

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