Malicious PDF — malware analysis report

Static analysis result for SHA-256 016269cbf54ed701…

MALICIOUS

PDF

34.1 KB Created: 2020-08-12 13:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 668d428bc04449e27fe331961e730de1 SHA-1: 4854c7c891993058f0d52a55385a756e2a7b2b40 SHA-256: 016269cbf54ed701852a4a03bd78f879c2beeccec7c9942ccaa2ab9ad6710ab5
194 Risk Score

Malware Insights

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

This PDF document contains a link farm designed to appear as a search result for "Cambridge first certificate in English 3 with answers pdf". The primary link directs to a redirector URL, which likely leads to the download of further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, including a malicious redirector, supports this assessment.

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=cambridge%20first%20certificate%20in%20english%203%20with%20answers%20pdf In PDF document text
    • http://files.mollyecklerart.com/uploads/1/3/1/6/131606261/degota.pdfIn PDF document text
    • http://files.polowl.com/uploads/1/3/1/8/131857626/5346932.pdfIn PDF document text
    • http://zejomut.nataliejimenez.com/uploads/1/3/1/4/131408280/009f5c.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/1/0434/6655/5556/files/47040508146.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0767/1448/files/academic_ielts_vocabulary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/24335970548.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2865/1938/files/how_to_delete_chromium_from_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6794/9724/files/25883234636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/napogezugigivu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7697/5768/files/strategic_thinking._download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/pajukujixidedumunu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/87091820213.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/69906483020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/zatula.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 5

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_off0000450d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x450D 5868 bytes
SHA-256: ee7d9905a7e7d97afd0ab93a2665fc7e485c81063ba83c4ad74273fbd49c64a1
font_01_sfnt_off000058ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58ED 10388 bytes
SHA-256: 1d531f86db8365d5b932e10173059557e4ca8e955ad0f406288b17fc80e1ef59

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