Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c91ecd9c0db994…

MALICIOUS

PDF

68.8 KB Created: 2020-08-22 16:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 237badea9b567b4fb4195d8b64512310 SHA-1: 65d540dbd116754b945fef0cde27511c0d22e1e4 SHA-256: f3c91ecd9c0db994d8a1ab1894e90d66d52877889385538cc9cf0fb8d7977761
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a worksheet, intended to lure the user to a malicious site. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf, a common tool for creating PDFs from web content, suggesting the PDF itself was likely generated to host the malicious link.

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=coping+with+grief+worksheets In PDF document text
    • http://files.jessiehodges.com/uploads/1/3/0/7/130776386/worimub.pdfIn PDF document text
    • http://www.therIn 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/1/0432/6676/9051/files/71055243285.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/23136619315.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1013/8017/files/20039459634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7343/7847/files/powiwixanerubibu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5567/6583/files/37872450763.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/42635029880.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6227/1898/files/35527027630.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/76045722112.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/fabururirogiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/13809233620.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0822/0574/files/rijutidapiziladojag.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_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 4980 bytes
SHA-256: 88395fc4938fbe78cf8bbcb9e0d3eb240e26cfcf8c47edd010ef87709d5281ec
font_01_sfnt_off0000e210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE210 10568 bytes
SHA-256: 9dd7d8ec7f4ee7a2766d83c8d50f3ab20c856528c4c6dbb3035bd4d13b3ac501

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