Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8c85752b244aa8…

MALICIOUS

PDF

40.8 KB Created: 2020-08-14 02:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c278c64ad8aae16b0423c5e72126959e SHA-1: 6499144c06c972ece81f7f3ea7e09ec30c04dfce SHA-256: da8c85752b244aa822d8d0818be1e67e4215befbfcdca0779ce63070a1180188
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `ttraff.ru`. The document body, though heavily obfuscated, contains references to academic books and the malicious URL, suggesting a lure. Additionally, a large number of external PDF links were found, many hosted on Shopify, indicating a link farm used for SEO poisoning or traffic redirection. The ML classifier also strongly flagged this PDF as malicious.

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=inter+1st+year+all+book In PDF document text
    • http://lujir.refugeriders.org/uploads/1/3/0/9/130969742/xigujidat-wanaguresiso.pdfIn PDF document text
    • http://files.flatspokecycles.com/uploads/1/3/1/4/131408529/6549756.pdfIn PDF document text
    • http://files.grahamlloydmusic.com/uploads/1/3/1/4/131453114/simovak_razuvujinege_dapufupo.pdfIn PDF document text
    • http://files.struckndesign.com/uploads/1/3/1/6/131606858/b2314b2e94.pdfIn PDF document text
    • http://files.marissahollingsphotography.com/uploads/1/3/0/7/130738639/f7e3b07537693.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/1/0428/9419/6902/files/tozalaxetufopewejemureni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/array_of_frequencies_of_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5149/1236/files/16945695319.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4828/6880/files/56101899774.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3986/4485/files/zomaxog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1030/8766/files/53337286054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/37562215735.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/99632480218.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/84534649461.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/gabuxorubijefelibide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7104/4770/files/80451916249.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/91148069310.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62ED 4976 bytes
SHA-256: e8412f883ed2b6b9569da3ea8ab38899bfbbd67b5f77fb5a89a98bfc0b30e0e1
font_01_sfnt_off000073ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73ED 10080 bytes
SHA-256: 2aaef06cb7512be71d3025cba34333f3c56ee8ab99f58a832dbc5ab5127c0170

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