Malicious PDF — malware analysis report

Static analysis result for SHA-256 c731b0b99392e624…

MALICIOUS

PDF

39.7 KB Created: 2020-08-14 00:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a9a34ea4be0af1ab8c2dc81c36e4e762 SHA-1: dcad79a153d7f31ca81b6a66082a405ba8453fa3 SHA-256: c731b0b99392e624db61ab1484206c9336ac8cf92359f52559d86c216e8649bf
194 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to manipulate search engine results or lure users to malicious sites. The primary attack pattern involves redirecting users to potentially harmful 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=abstract+wallpaper+hd+for+mobile+free In PDF document text
    • http://files.mission-justice.org/uploads/1/3/1/3/131380083/toziwuboge.pdfIn PDF document text
    • http://bibeben.mrwegnerinroom92.com/uploads/1/3/0/9/130969656/meragubero_bodejinemorire.pdfIn PDF document text
    • http://files.ailsacatherinestevenson.com/uploads/1/3/0/7/130739699/judose-putijunigukus-pirele.pdfIn PDF document text
    • http://files.emsteps.com/uploads/1/3/1/4/131438308/ea6f06f19a5775.pdfIn PDF document text
    • http://kudeguba.saranyawellness.com/uploads/1/3/0/7/130775818/6853108.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/1/0439/2216/1832/files/45961199793.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/tajutiretafesib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2985/4368/files/72593707604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/kinimerugexanumi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2535/6184/files/borderlands_2_minecraft_area.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5353/0782/files/duxikuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4925/4048/files/adobe_reader_for_pc_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8221/9674/files/zomofivixowiju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/waxufajomipufabixepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/jesanakifaxox.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_off00005db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB5 5616 bytes
SHA-256: 42912d2aeedb113d76be18639272960c2bf9b29ae03a94b6075b2a7b7f658578
font_01_sfnt_off000070a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A8 9656 bytes
SHA-256: 150728a08a13f65ba9ef0937e1da5b7f7e5c92cb4dbf8ece3b1743146a6914be

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