Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a8392f4d2e5d4e…

MALICIOUS

PDF

42.8 KB Created: 2020-08-09 09:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4956da0d9f83808014f8dc7b0d2e3271 SHA-1: e912952c0bba659c1554b7a29aa178949145e0b6 SHA-256: 51a8392f4d2e5d4e702f70f0f36535404d49dfa8899cf4c02c541723331cb726
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.ru. Another critical heuristic, PDF_SEO_LINK_FARM, indicates the PDF is part of a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, contains the string 'Tswana culture pdf' and the malicious URL, suggesting a lure to drive traffic to potentially malicious or SEO-abused sites.

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=tswana+culture+pdf In PDF document text
    • http://files.phyllistoburen.com/uploads/1/3/1/3/131380213/wigodaborujis_jadamozoni_kinaxuzomos_sipilu.pdfIn PDF document text
    • http://files.swcsdcareertech.com/uploads/1/3/2/6/132681392/1678847.pdfIn PDF document text
    • http://files.elpapartments.com/uploads/1/3/1/1/131164387/b118844a320.pdfIn PDF document text
    • http://zolafe.expresssignandneon.com/uploads/1/3/1/6/131636725/vutugobowirasis-laniwaja-nidujazig.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/1/0433/0163/4213/files/32859291441.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1242/1789/files/atube_catcher_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/unity_raycast_hit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/2355/2927/files/aluminum_lithium_alloys.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2125/4312/files/71989759402.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9741/5077/files/77648323809.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/84917052308.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4018/4232/files/53504340072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/91228890755.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6998/9279/files/27069114515.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/85940524451.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7304/3622/files/modern_brazilian_portuguese_grammar_a_practical_guide.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 3

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_off0000671f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671F 5188 bytes
SHA-256: 8539d722c788cc75567a5bb5bc6e4e549fd14bd286221adfd760d2de46059c3e
font_01_sfnt_off000078e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78E8 10716 bytes
SHA-256: 29817093f24e4014f09b15f2d9515e614ff123695bf391fbc5adc8a511672dda

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