Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b595cd7b4ef65ba…

MALICIOUS

PDF

42.7 KB Created: 2020-08-21 15:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9d1db8a7de368d5bde386ff93a09ce24 SHA-1: b75c7f41e09ed53f1989720c66bbf310cf1bc2df SHA-256: 3b595cd7b4ef65bad8f6933bbaf391bc03e70af8c2455ccc13f283c0c6b60e33
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=first+week+kindergarten+worksheets', is designed to redirect users to malicious content. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, many hosted on Shopify. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=first+week+kindergarten+worksheets In PDF document text
    • http://vivezaji.rbef.tv/uploads/1/3/1/3/131398140/nekibu-xijapavujatot-gevuvix-wilefif.pdfIn PDF document text
    • http://files.helioshk.com/uploads/1/3/0/9/130969708/2a3d4a.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/1/0431/3851/5098/files/xufabajasalarutu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7395/3187/files/toyota_corolla_2020_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4228/2394/files/mopomofekulofupasenulive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8832/1435/files/lakara.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/45949337750.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3966/1986/files/pawij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/1966/8377/files/vitubatixijajuvinudesov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/dagulipu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1016/9759/files/49917102732.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/tic_tac_toe_javafx.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/21050081648.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 1

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_off00006891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6891 5168 bytes
SHA-256: aff62b56c0902f99dcb8699a9032e0ee68386e16c810414652b9191b8f25ff61
font_01_sfnt_off00007a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2F 10472 bytes
SHA-256: 4e36c23dc6b8ca9c0c19b0b68822d85272b64624de8715ea4dfe500c8a3b8e28

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