Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb51de5baba1a88…

MALICIOUS

PDF

39.8 KB Created: 2020-08-17 05:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4a36078dd3512e2d45afc4db2eabab11 SHA-1: a6966b7e036090be22f0084bf012bd6ac6380d3f SHA-256: 2eb51de5baba1a88d51fe72246f0867b58c09bf9414f94784ad8b4a59a6cc696
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of the primary links, however, directs to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'Bruchrechnen' (fraction calculation) and 'Ubungsaufgaben mit Losungen' (practice problems with solutions), suggesting a lure to disguise the malicious intent. The presence of a malicious redirector indicates an attempt to lead the user to a further stage of attack.

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=bruchrechnen+%25C3%25BCbungsaufgaben+mit+l%25C3%25B6sungen+pdf In PDF document text
    • http://files.cwudaytonoh.org/uploads/1/3/1/3/131379553/dubamak.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/1/0438/0380/3808/files/gusano_barrenador_del_maiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3997/2773/files/7446534033.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1980/4582/files/57078950621.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7416/4638/files/58605403935.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/3108/0605/files/pathogenesis_of_candida_albicans.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3941/6732/files/fivura.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/automobile_engineering_projects_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/gonizubebudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5581/6599/files/vakorewumaronasotobo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4147/0117/files/goleruxepotetaxavurobivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6299/2799/files/tuxonesuno.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 1

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_off0000587e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x587E 6016 bytes
SHA-256: 4265d103776aabbea706bd39ad8b53decbf17d10754af9d25f980e3d19be7b10
font_01_sfnt_off00006c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 10864 bytes
SHA-256: 20da431043f932c41c95d1eca4e159d1d8a21320f10a7c993ea49a6e5de025de

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