Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4c492231a99157…

MALICIOUS

PDF

45.1 KB Created: 2020-08-21 17:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5adc49cab9a6427be67d06aa26252402 SHA-1: 1fc8b2e174cb9f6c41a6e6b92e44c685cbd64589 SHA-256: af4c492231a99157cc190150d4e779c5e4fdf1958735a9238dba4000194823a3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous external PDFs, with one primary link identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Agriness sistemas e tecnologias de informa��o' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=agriness+sistemas+e+tecnologias+de+informa%25C3%25A7%25C3%25A3o In PDF document text
    • http://files.mattrobinsonphotography.com/uploads/1/3/1/6/131637056/xixure.pdfIn PDF document text
    • http://files.uscitizenshipprepcourse.com/uploads/1/3/0/7/130739288/8269037.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/1/0440/8783/6837/files/renefezavipev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xopafomapezujiwowab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/sujudifafibegonezirovez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/30496522415.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/25975490729.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8067/8557/files/project_budgeting_methods.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5327/6574/files/21522315183.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/39135019572.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4958/0704/files/fologumetaronexuli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4940/2016/files/wonuzolelu.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 3

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_off00006115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6115 5828 bytes
SHA-256: 9bd3e8b3a8553e3bf5186406c1dd8c8395b19e09feb351f5a9d97bfa97b6c301
font_01_sfnt_off000073ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73EA 17296 bytes
SHA-256: 6845d12289d68c0a00dfa25599b98ea875a7dcffaaa3bb6332024a855ece6a61

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