Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9ba108de14406e…

MALICIOUS

PDF

40.9 KB Created: 2020-08-15 12:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 02ff7738f3d3abcbfb290755aea2bab9 SHA-1: b827968e0a96704abdc8cfec7b0f3898d15ad609 SHA-256: fb9ba108de14406ece27b9909856ac4dcd410f95ee9974498319fbbc6986a11d
194 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to appear as educational worksheets, but it redirects to a malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the primary URL, https://ttraff.cc/wb?keyword=number%2011-20%20worksheets%20for%20preschool, is part of a known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.cc/wb?keyword=number%2011-20%20worksheets%20for%20preschool In PDF document text
    • http://files.dkgca.org/uploads/1/3/0/8/130874205/gufobelesufud.pdfIn PDF document text
    • http://files.hlcacademy.ca/uploads/1/3/0/8/130873804/bezobarowe.pdfIn PDF document text
    • http://sevufa.themodernmidwife.org/uploads/1/3/0/7/130776647/2693135.pdfIn PDF document text
    • http://tozuwotig.halfmoonyogaandart.com/uploads/1/3/1/3/131382406/remeba.pdfIn PDF document text
    • http://files.horizonslearningadventures.com/uploads/1/3/1/4/131437750/xodikuwapo-taxofe.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/1/0431/5804/4827/files/21425611237.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4495/3509/files/ritmoneuran_bula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6741/6471/files/xibuxozisonoparej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/2175/7590/files/pugixi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/22727361750.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/vonedewifip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5774/9917/files/parestesia_adalah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6046/9660/files/amlodipine_besylate_davis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/bewigumuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4798/4026/files/brief_answers_to_the_big_questions_stephen_hawking_download.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 3

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_off0000608b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x608B 5668 bytes
SHA-256: 89a5679e73aa8ddaf10fbabdd6f5c335500ed2bb60559f009a7be0a040eafd23
font_01_sfnt_off000073d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73D2 10284 bytes
SHA-256: f37e1dad375aa364bf7817f91956e2a03c16fda3c6b7db009acf356b8d9db8c2

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