Malicious PDF — malware analysis report

Static analysis result for SHA-256 721181a6ca2a687f…

MALICIOUS

PDF

42.6 KB Created: 2020-08-27 18:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d36ed4cf5092ea18c03243af104e5bbe SHA-1: 12ea5810833eec2e55a10b1c03ad41f6717c8bf1 SHA-256: 721181a6ca2a687f81f0427da181b6ea717904e098880071d7b5c6e59ec7ecb6
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure designed to lead users to malicious sites. The primary redirector URL is https://ttraff.com/pify?keyword=mechanical+vibrations+rao+6th+editio, which is flagged as malicious. This suggests a phishing or scam attempt, likely using a lure related to the book title in the URL. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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=mechanical+vibrations+rao+6th+editio In PDF document text
    • http://vuvat.thedetailors.com/uploads/1/3/0/7/130739591/zexufariledet.pdfIn PDF document text
    • http://files.hurstgreenshires.com/uploads/1/3/1/1/131163914/f8bf1f6.pdfIn PDF document text
    • http://wudor.jewsforyeshua.com/uploads/1/3/1/4/131452841/4534708.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/1/0435/4536/2581/files/wokimu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0608/9640/files/cox_remote_not_working.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8679/0304/files/19047694347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/10651944012.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1510/0826/files/barron_s_sat_math_2_11th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1959/2102/files/11984275362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/baby_doll_house_adventure_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/67570615069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5030/2616/files/rizamajurudeji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6819/3952/files/2180087208.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 2

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_off0000666a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x666A 5388 bytes
SHA-256: 5474c327a6d4de52fc9422688676b67b074a853a9f0c0cf03a24fd3a3862c57c
font_01_sfnt_off000078a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A9 10816 bytes
SHA-256: e41f213063afe04c1d6727ee966f381a1f5ca666999145de117f0b143e42085c

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