Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6a766dfe6a2d4a…

MALICIOUS

PDF

52.5 KB Created: 2020-08-06 01:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bc7d5bf8405cd16360a22671e94b8cf2 SHA-1: ea156677f1911616945583ef0aa68043f08bdcf1 SHA-256: fb6a766dfe6a2d4a5fdfb586910a7ce29b77e84fa2b81a1533b91ae9e0b89842
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as educational material. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates the primary URL leads to malicious infrastructure. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger link farm designed to attract traffic. The ML_NYX_PDF_MALICIOUS model strongly supports the malicious classification.

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=ncert+class+12+accountancy+part+1+pdf In PDF document text
    • http://files.h-mun.com/uploads/1/3/1/3/131379296/tofazaduf.pdfIn PDF document text
    • http://files.peterandrewsoam.com/uploads/1/3/1/8/131872178/paludapakifewuvapi.pdfIn PDF document text
    • http://files.saharasistasols.com/uploads/1/3/0/7/130775145/wolesilerube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3006/8898/files/82481031561.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9140/9558/files/75373331918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/19169751426.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/87980496289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/82704520014.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/78559103054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/83255125657.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/23508359505.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/sazemajazokirefuzafamupir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7505/1421/files/27165730186.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/xunifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/6122/7169/files/lion_otter_beaver_retriever_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5082/5893/files/arris_tm822_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/rifisemu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E7 5404 bytes
SHA-256: 74c977e97434d2a4260f28922fee916dee6c075b16d15bdf061ace2ddd1bdb22
font_01_sfnt_off0000866f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866F 10100 bytes
SHA-256: f1a1eb4e715b1744cdd3ae8fa926a5602acc795d55c31251176d19828f2f945a
font_02_sfnt_off0000a91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA91E 8188 bytes
SHA-256: 0c2ca167476a4e9f3c9c7d79ef71e9b25debb60c071bdeaa95ca140a9bf8b2e1

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