Malicious PDF — malware analysis report

Static analysis result for SHA-256 77720e9e43c5b401…

MALICIOUS

PDF

47.7 KB Created: 2020-08-07 01:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ca949bcc943c8f7d36f1e8f389dc27de SHA-1: a8189e905d12b9ccbfa64cab8730bf51cdc1f10e SHA-256: 77720e9e43c5b40131019e32b6b67d1de961fbbf6e0447311e96dbb52f903c8b
194 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to redirector infrastructure, specifically 'ttraff.ru', which is flagged as malicious. The document body, though heavily obfuscated, contains the same URL and references to other PDF files hosted on Shopify and other domains, suggesting a link farm or SEO scam. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to a malicious URL via a seemingly legitimate document.

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=acute+pulmonary+oedema+pathophysiology+pdf In PDF document text
    • http://files.frommairpad.com/uploads/1/3/0/9/130969966/wurewe_banonirevibu_jojajivi.pdfIn PDF document text
    • http://files.wolfisle.com.au/uploads/1/3/1/4/131407406/23dccc4e5.pdfIn PDF document text
    • http://files.stadiumcrashers.com/uploads/1/3/1/6/131606758/902fac9.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/1/0431/9277/8916/files/96546729316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/russian_grammar_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/tezupananagebobowepe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/fokekuxul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/fumisazutulinugodad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/active_directory_interview_questions_and_answers_l3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/fajawogogijubedage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2277/7496/files/97373294266.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/5404153390.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4962/3462/files/50775663643.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/2634/6147/files/sullivan_college_algebra_10th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/24155119792.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_off00007deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEB 5660 bytes
SHA-256: 66a3590d236ff43bfcedd61a537fcdd7088d1575c4800c8ab29321611328f35d
font_01_sfnt_off00009112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9112 9508 bytes
SHA-256: ad0e5cef62d752aba4c4708cc11f13b24034773e6bf1112930162dc9893d4cdf

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