Malicious PDF — malware analysis report

Static analysis result for SHA-256 81700ed972368ce1…

MALICIOUS

PDF

35.9 KB Created: 2020-08-06 05:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2a409ba23bc487526db9ed07e27bb70b SHA-1: ab5a1e70fdec4e5f4a4cd4810c7cf56c463b0bda SHA-256: 81700ed972368ce12a3d39d5c6a4b3f565d8f4be2bca52b1e08c90a0361a8cbb
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service, suggesting a link farm or SEO poisoning tactic to lure victims. The primary malicious link directs to 'ttraff.ru', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and other PDF links, indicating an attempt to drive traffic to potentially harmful sites under the guise of providing educational materials.

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/wb?keyword=ocr%20a%20level%20biology%20textbook%20answers%20pdf In PDF document text
    • http://files.dndamsels.com/uploads/1/3/0/7/130775551/3863589.pdfIn PDF document text
    • http://files.mentalhealthjunkie.com/uploads/1/3/1/4/131407183/670c2.pdfIn PDF document text
    • http://files.glenburniequicktaxi.com/uploads/1/3/0/7/130776413/zisivunu_pubifiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/bojibujujiwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5154/7800/files/tejiwulabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2331/7662/files/dutubekerivasedulare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/zopebaxixatewoxekiburuzo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/91106021931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8388/8808/files/marc_benioff_book_behind_the_cloud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0742/7238/files/fodozetafazitajurozibep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/lofegugegedumixujuzedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5896/1315/files/mojamige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/markdown_blank_line.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6477/1238/files/math_algebra_rules_pdf.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_off000040df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40DF 5664 bytes
SHA-256: 5fcaa28ecf3abe1e0ab1256028727d0769342bfb83f2a8694043a42774d4a500
font_01_sfnt_off0000544d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x544D 9012 bytes
SHA-256: fed8916ca35bbfd4caf27e07d5a9884ce0194d9f6e8414f8e72e6eaf2612873f
font_02_sfnt_off0000730b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x730B 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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