Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f921e59a95974b…

MALICIOUS

PDF

46.9 KB Created: 2020-08-19 07:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cf3ff445c09f2d6be898dbcdb8821926 SHA-1: 78920521e51528c299ccd1ca3ac4e6a6102c0e8e SHA-256: 87f921e59a95974bda2104a84d6e3803cfde637dabb5701137431a9a8b6fc05d
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, including a critical finding for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the one identified by heuristics. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

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=maglev+train+seminar+report+pdf In PDF document text
    • http://files.stjohnsecofin.com/uploads/1/3/2/6/132682119/pipekexug.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/1/0432/7027/5236/files/bowesimoxuduvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3828/5725/files/42285949263.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5199/8623/files/welding_skills_workbook_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/16383154737.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3805/6354/files/11038375324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5768/4375/files/17509795717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/3673/2566/files/69280388067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/activity_based_costing_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/1990500553.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/7058/0902/files/34064226387.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 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9B 5428 bytes
SHA-256: 6d095aeca97bc1f7df0118320aaf850c38a7d28cf3f5829b2ff7088c479baf41
font_01_sfnt_off000081fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81FE 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00008a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8C 10628 bytes
SHA-256: 0fd2ef7efc0a5629a48a359c1f332da1d9d9536890c903b25fb4b9de21be754a

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