Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e42c2c253a61278…

MALICIOUS

PDF

34.2 KB Created: 2020-08-15 15:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8dd9098b297bb4ce84a300112e43d34a SHA-1: b73e678b1bcdda5a89aee27fba1207d1af5cde8c SHA-256: 9e42c2c253a61278be3c5b7fa08a0edbec5aab719037a74e95c5a6d20ee3eb2e
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, directing users to a URL disguised as a worksheet answer key. The document body, though heavily obfuscated, contains the same URL and references to 'wkhtmltopdf', suggesting it's a lure. The presence of numerous embedded URLs, many pointing to Shopify, indicates a link farm strategy to obscure the malicious destination. The primary malicious URL is https://ttraff.cc/wb?keyword=worksheet%203.3%20graphing%20and%20solving%20systems%20of%20linear%20inequalities%20answers.

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=worksheet%203.3%20graphing%20and%20solving%20systems%20of%20linear%20inequalities%20answers In PDF document text
    • http://files.theredroomproject.com/uploads/1/3/1/0/131070559/9294c2cd.pdfIn PDF document text
    • http://files.cattd.com/uploads/1/3/1/4/131438203/selumudeduxip.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/1/0438/8998/3643/files/10661022091.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/78471155325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/factors_affecting_antigen_antibody_reaction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/81892290162.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6406/5174/files/59378062885.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/carnival_of_venice_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2100/1119/files/33398533060.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/zigoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nemubowakupupoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5784/8224/files/941_angel_number.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_off0000449a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x449A 6108 bytes
SHA-256: a574f7233489f3fedae1813067282d182f977c3fbafee34c92a7cbef16d9f81e
font_01_sfnt_off00005962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5962 10068 bytes
SHA-256: c3a748a6624dc1b55af4ff0ebf462fddf71a1ac3f4dc5bb7ded8e68aab634342

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