Malicious PDF — malware analysis report

Static analysis result for SHA-256 51781306e8ea0ec5…

MALICIOUS

PDF

45.5 KB Created: 2020-08-11 04:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ae415dd0c6e8d30fa1db1dfe830a1305 SHA-1: 56121a28fe936b9a357ca23520a9ece19c625316 SHA-256: 51781306e8ea0ec5e0bf783c35a49676be324c5086e4996c4eb0e8d44a4acb02
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user to the malicious URL via the embedded links, likely for a phishing or malware distribution attempt. No scripts were extracted, limiting the analysis of direct payload execution.

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.com/pify?keyword=mediana+estadistica+pdf In PDF document text
    • http://files.newworldtribe.us/uploads/1/3/0/8/130874143/6813ca.pdfIn PDF document text
    • http://files.earthwiselearningcenter.com/uploads/1/3/1/3/131382590/fajokotonuw_nubodaxazexiji.pdfIn PDF document text
    • http://files.cougarthreads.com/uploads/1/3/0/7/130740438/bbfae0a5e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1484/8671/files/cerwin_vega_vpas10_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4916/4705/files/mosadirujekufatuwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/11166673771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/94624668050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4430/5056/files/30964164739.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6544/2457/files/nomutu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/sample_company_profile_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/98484313261.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8060/6111/files/tosaxevezumexivebowavuwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87678197609.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1103/7591/files/xolikudirej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/adding_mixed_numbers_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/71854625098.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 7

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_off0000672a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x672A 5028 bytes
SHA-256: 7d5707494a9d6fa34d0beef2ec43f8a84d0ac62101f3055efd45aeee7a066668
font_01_sfnt_off00007859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7859 15676 bytes
SHA-256: 3aed759fdcc7a33d622efa28c7b19b53e106ccbca9ff44ca1d16a98851b5be55

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