Malicious PDF — malware analysis report

Static analysis result for SHA-256 404d99628e1d88bf…

MALICIOUS

PDF

41.2 KB Created: 2020-08-13 23:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7dbe978301e756996953baeefd63cdff SHA-1: eb178283d63ade64f02ad46add2d238d57db2d1b SHA-256: 404d99628e1d88bf5ee8699eae3582ab8d80f63b5655e95c91099b16a51c38d5
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination. It also features a large number of SEO-optimized links pointing to various PDF files hosted on Shopify, suggesting a link farm designed to manipulate search engine results. The document body itself contains garbled text but includes the primary malicious URL and several benign-looking URLs, likely part of the SEO strategy.

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.ru/pify?keyword=andaman+map+pdf In PDF document text
    • http://files.jchsmediacenter.com/uploads/1/3/1/6/131606537/7858983.pdfIn PDF document text
    • http://xopobino.rocheblackbeltacademy.com/uploads/1/3/0/8/130874218/jazibologiwepa.pdfIn PDF document text
    • http://files.yestoyouthgala.org/uploads/1/3/0/8/130814717/9439970.pdfIn PDF document text
    • http://fewufu.oleriaemporium.com/uploads/1/3/1/4/131407263/bawojagoxumelujewevi.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/1/0427/7505/2454/files/toveruweladulawolafikip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7966/1736/files/saddleback_educational_publishing_basic_english_grammar_book_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/1980/9447/files/dynamic_memory_allocation_in_c_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0703/9912/files/rujuziwanuwulelexenil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2132/8807/files/81508465150.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/91794342227.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0390/2112/files/content_type_text_html_php_script.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5593/9733/files/basic_multivariable_calculus_marsden.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5489/0149/files/20482989140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7704/1304/files/81035760057.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7630/5564/files/calculus_a_rigorous_first_course_velleman.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9520/3745/files/89531176264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/gogutaxuz.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 4

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_off000060b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B9 4868 bytes
SHA-256: 670c7eaede6e3ccb7d0569d3ad8d854c7ee6da5570156abb823883e2dbe85db4
font_01_sfnt_off0000713e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x713E 12108 bytes
SHA-256: 5a28ba08d3c7dae4c5b3823c7587f51b3e534efc01c5a02479a606a23ba33536

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