Malicious PDF — malware analysis report

Static analysis result for SHA-256 1685419a91fb27e8…

MALICIOUS

PDF

39.9 KB Created: 2020-08-25 16:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ec8fff4a7930d1a437b9aefc1955b73d SHA-1: 9163ce4bb17c351d87b35f88e3dfe81a7ea312a9 SHA-256: 1685419a91fb27e8b693f8e4d7df1704e2dd92d3f66ea7ab8c38c90a1fdd5d5b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and redirects to a known malicious URL, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is used to obscure the final destination and potentially track user engagement.

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=bullying+pdf+espa%25C3%25B1ol In PDF document text
    • http://files.frankpbc.org/uploads/1/3/0/7/130739895/nutepowujot.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/1/0430/8844/5604/files/73258854141.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8738/1155/files/titakomevigedirav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8181/0595/files/excel_invoice_template_with_logo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/54931477514.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5205/7244/files/rumagexazumadifebix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4246/3126/files/55164474516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/92408181701.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4094/8892/files/61111530316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/pologipap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/dejipur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/39390542172.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4413/4294/files/allahabad_bank_current_account_opening_form.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_off00005df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF2 5476 bytes
SHA-256: 6457d5a8c904e3a10fa40c85a58455e24a44e0486197db07fbb621d6eae66500
font_01_sfnt_off00007074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7074 9700 bytes
SHA-256: 92c371f5b92b3da89da3262eb0c15e885abdbf7d4e06598ebd99d1df08ccd9bd

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