Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cfb41c06b31f97…

MALICIOUS

PDF

40.2 KB Created: 2020-08-12 06:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fbc58d9caf45f1326682c7fb101649d9 SHA-1: 13ea35728a5c5f56c913e0238e09e36acd165cdd SHA-256: 18cfb41c06b31f97ccd18f79647a5b09dd9f3b1b8b40264d838503c8bd689b87
194 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to a redirector service (ttraff.com) and a large number of PDFs hosted on Shopify. This indicates a link farm or SEO poisoning tactic designed to attract clicks. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links reinforces the malicious intent, likely to deliver a second-stage payload or phish for credentials. No scripts were extracted, but the PDF structure itself facilitates the attack.

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/wb?keyword=essential%20elements%202000%20book%201%20pdf In PDF document text
    • http://files.tcnazchurch.com/uploads/1/3/2/8/132814990/voxoruxumaripog.pdfIn PDF document text
    • http://files.spanish.thelanguagehub.net/uploads/1/3/0/7/130776439/9285612.pdfIn PDF document text
    • http://balamajik.msfitch.com/uploads/1/3/1/4/131406082/7726139.pdfIn PDF document text
    • http://files.vanaudelanalytix.com/uploads/1/3/0/8/130874587/filebaniremi.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/1/0428/6224/8102/files/72701062046.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/lekefarenipigiwugegipim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/vivuvixevaruvorewedikumu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/31912924056.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/24851697774.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/circle_of_5ths_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/60069057282.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7311/7091/files/allan_kardec_evangelho_segundo_o_espiritismo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0703/2990/files/tratamiento_de_amebiasis_intestinal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5923/3443/files/demewuvupanuvewomatodubuj.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_off00005df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF6 5580 bytes
SHA-256: 8f7ae641937d54cd7ae63afaa7ee8e117a8b05935c6d4dabca1e4c1c64ec182e
font_01_sfnt_off000070dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DC 10196 bytes
SHA-256: e3f89aae6e72bcd9067016eaeca44ef098e05bba2243484bf04d2b98a07b6266

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