Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ef1ee3e4808739…

MALICIOUS

PDF

39.0 KB Created: 2020-08-15 11:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b1de1f773f1f658020a72c1f957f44af SHA-1: 162444d8a6ee21eb35fc4416452f15330f6eb27e SHA-256: d8ef1ee3e4808739bae0f9f86d0c3c9745f4f8c792cf43052589a3cbc48d442d
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, a technique often used for SEO manipulation or to distribute malicious content. One of these links, https://ttraff.ru/wb?keyword=pomodoro%20technique%20pdf, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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/wb?keyword=pomodoro%20technique%20pdf In PDF document text
    • http://files.newhopeohio.net/uploads/1/3/1/3/131381103/cf274db.pdfIn PDF document text
    • http://files.mackaychocolatebouquets.com.au/uploads/1/3/1/6/131636916/lekedona-nemufikibusuka-bodujufopomi-tusisuve.pdfIn PDF document text
    • http://kinetaru.internationalhrnetwork.org/uploads/1/3/1/0/131070487/6608165.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/1/0432/5415/3371/files/83171367989.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4190/5050/files/the_cask_of_amontillado_by_edgar_allan_poe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1823/1709/files/10466236737.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/96997367981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8624/0162/files/62565429574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/35346558955.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4944/2715/files/catalog_cp_in_cadivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3673/5650/files/3d_animation_making_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/tixafiwiriza.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_off00005b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1A 5104 bytes
SHA-256: f9d40f5c57f38eb3f0bd57509d900baca64b6d6f2e4426c8e1b11a4dd5aafb5d
font_01_sfnt_off00006c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C51 10348 bytes
SHA-256: 761ef02306d9188c068ca0959ea92eb33ea961e6fc0c89a52f24d4dbef3bd16b

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