Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda4a53acb409ff5…

MALICIOUS

PDF

47.0 KB Created: 2020-08-11 10:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a8578e1fc09956ed8093d00a7cc4ae14 SHA-1: 3495897ad744e3f68ce8e90c4d6756b608f01a10 SHA-256: cda4a53acb409ff516f73745dda80bc606fcbf562b464cbc4108ade336fd2b0f
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link redirects to a known malicious domain. The ML classifier also flagged this PDF with high confidence. The primary malicious link is https://ttraff.ru/pify?keyword=advanced+mathematics+solved+problems+pdf, which is likely used to redirect users to further malicious content.

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=advanced+mathematics+solved+problems+pdf In PDF document text
    • http://files.prueadams.net/uploads/1/3/1/4/131438642/9c32a9f708.pdfIn PDF document text
    • http://bujegok.thefightingwarriors.com/uploads/1/3/2/6/132683014/7621205.pdfIn PDF document text
    • http://files.blackmarksproduction.com/uploads/1/3/1/8/131871658/1535363.pdfIn PDF document text
    • http://suparagoj.bridgetownacupuncture.com/uploads/1/3/1/4/131452938/9994241.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/1/0431/6374/6453/files/2017_audi_a5_convertible.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/61169391496.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/89456268514.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6254/1982/files/uc_irvine_library.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1026/9085/files/titel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/1478/7996/files/stephen_berndt_alois_irlmaier.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/96051604878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/computer_literacy_test_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9952/1181/files/kixubevulabukatizejoze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2292/6492/files/batch_production.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/7658813943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1763/3945/files/25305313814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/muzadifave.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3631/9645/files/8648392215.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 2

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_off00007890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7890 5584 bytes
SHA-256: f2401738d219185f03386a7191fc84359b7c44a2806b972e6d276b62b4d117dd
font_01_sfnt_off00008b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5A 10352 bytes
SHA-256: 0bdfdb949f3e983fdc25eb1a66c858ed0ca01ef9afc23b09674561077d986041

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