Malicious PDF — malware analysis report

Static analysis result for SHA-256 825d2e5c31367d32…

MALICIOUS

PDF

49.8 KB Created: 2020-07-30 01:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9da1f2644a8d7c8a59587346ffbf550c SHA-1: a309512e44724a57da1cfbc88b5d7d7bc331c25e SHA-256: 825d2e5c31367d32fec4e31d6354e5b76ecb93a643488b0776b324b3533e8e9b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to a redirector service (ttraff.ru) disguised as educational content. This indicates a link farm or phishing attempt to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=simple+algebra+equations+worksheet+pdf In PDF document text
    • http://files.hackingdermatology.org/uploads/1/3/1/6/131606465/0c6657d48a30a.pdfIn PDF document text
    • http://files.chisagocountyfair.org/uploads/1/3/1/3/131379183/4eb7298c8b.pdfIn PDF document text
    • http://files.gaia-latableturquoise.com/uploads/1/3/0/8/130814070/fosepowikugerava.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/1/0433/5733/9813/files/voruduvedidanezebib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8643/8807/files/40454992296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/woxunaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5131/1513/files/welefobajoxajatepafa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/80802617450.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0157/6604/files/rotejitarutirojitemumuzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/20311744406.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7046/3895/files/libopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/52103405556.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/37853171810.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0323/8811/files/23647885116.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/66570083503.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_off000082a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A7 5860 bytes
SHA-256: fb2cd7b8f20804b762e0c697aeb18166cacbd7507f258cc31be4b102896eccbd
font_01_sfnt_off00009665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9665 10308 bytes
SHA-256: f4bc3d888fb7b88b56f5cc01c28faf8c75d5cd910c34614dc16b2a8dd1a0882d

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