Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff38450bc1239981…

MALICIOUS

PDF

42.2 KB Created: 2020-08-12 11:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4e89bb6e8ab0d612b32362bd07fd64b6 SHA-1: 280bc4e7c9080e911c3084c8e5c505c5cac36609 SHA-256: ff38450bc1239981c5f1d8269fc4f09b76066a0b52bc58b37438ba912581e8a7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a large number of external links, many of which point to benign Shopify domains. However, one critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is used to obscure the final malicious destination. The document body text, while containing keywords related to practice tests, is largely garbled, suggesting it's a lure to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/pify?keyword=exam+essentials+practice+tests+cambridge+english+advanced+2+pdf In PDF document text
    • http://files.earthandwaterdance.com/uploads/1/3/1/4/131406610/4398f.pdfIn PDF document text
    • http://files.redmousedesigns.com/uploads/1/3/0/9/130969708/8cca52924.pdfIn PDF document text
    • http://files.theempoweredyou.com/uploads/1/3/1/4/131406258/5671868.pdfIn PDF document text
    • http://files.joycerandall.com/uploads/1/3/1/4/131406663/2387307.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/1/0436/5654/4409/files/public_policy_formulation_and_implementation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/gavivuvinumewaxurakax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/84905962491.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/robert_half_2016_salary_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/78534048934.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1048/0537/files/fibazed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6671/0433/files/18190378663.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/4550/6459/files/english_lessons_for_grade_1_students.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3641/5899/files/41560304771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8280/8472/files/15909403890.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_off00005bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBF 5924 bytes
SHA-256: 2256ebf07a2dbab41714b53210ec0841e1dc998a40dd523c5aa381291a95ddab
font_01_sfnt_off00006fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC5 16288 bytes
SHA-256: 8b568d6b3993fc6a39d85e226010035a53b35d864bbda9cfbf6359ddb7f504c4

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