Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbf4dc94f03b580…

MALICIOUS

PDF

41.7 KB Created: 2020-09-09 21:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0a51cc2129318691e41aedab80fee17f SHA-1: 4594b7df5dfa8ceb8db9912601dd906f98f9caff SHA-256: efbf4dc94f03b58037c3b5e532e8597600fc57b4a0c992232748effce8dd3206
194 Risk Score

Malware Insights

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

The PDF document contains a link disguised as a 'cassava farming proposal pdf' which redirects to malicious infrastructure. The ML classifier strongly indicates maliciousness, and the PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or redirection tactic. The primary malicious IOC is the redirector URL.

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.club/wix?keyword=cassava+farming+proposal+pdf In PDF document text
    • http://files.hyderabad.bolgate.com/uploads/1/3/0/9/130969381/kojexeruxafawawesa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/2e79a6_845509c8b51a4d9f9f6f8abee2f7f2e4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d2057d_5cfe0905aa714a019dc07ec5b14d5992.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/418e76_ce1c7e780714426a91afc253b008da52.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bc79a4_cb0b57ec0dbb423e816f859e607108b8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a48928_4ed417759d2f41828362e2e506be5555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/vedigatatumonozidatupale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4173/4307/files/96996461961.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0395/9720/files/ligne_10_aix_en_bus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1868/9434/files/5512898053.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8961/7311/files/29866548667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3080/6679/files/education_board_bd_result_with_marksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/luwakanumibulotenedimuwuj.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_off000064ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64CE 5324 bytes
SHA-256: bcdbf2bc5c1700bf9e8f0eec25968d55716f78f910d5b94575455ba1970dafc7
font_01_sfnt_off000076db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76DB 10316 bytes
SHA-256: cb077396eb448fe96b8ed38bb9f6c39c2723d493a30291c52dad5d55d7079034

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