Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c8259b1b074b4a…

MALICIOUS

PDF

43.2 KB Created: 2020-09-29 19:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 21d76fbc5cfca2fbd1659514489b4dc7 SHA-1: bdcb9e2c827ec54805cb9bc25bfa0c7c221949f4 SHA-256: 40c8259b1b074b4af21012891aa487614bae57a5e68d053b50f9de3b95ba1f14
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a URL associated with malicious activity, specifically a lure for downloading 'Adobe PDF Reader'. The document body and heuristics confirm the presence of malicious redirector links and a link farm, indicating a phishing or malware distribution attempt. No scripts were extracted, but the primary attack vector is the malicious 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://cctraff.ru/strik?keyword=adobe+pdf+reader+download+windows+7+32+bit In PDF document text
    • http://rijewadip.mykwalk.com/uploads/1/3/1/4/131407406/satamuxamovosemoma.pdfIn PDF document text
    • http://jifagi.susmanosextendidasmexico.com/uploads/1/3/1/6/131636755/4757915.pdfIn PDF document text
    • http://tirenuw.wehaulcheapvictoria.com/uploads/1/3/1/6/131606289/f1e4685.pdfIn PDF document text
    • http://wozepepug.medisurgeltd.com/uploads/1/3/1/3/131380005/vuxul.pdfIn PDF document text
    • http://files.bensharpton.com/uploads/1/3/0/7/130776350/soxazudoz.pdfIn PDF document text
    • http://talubupu.hdblues.org/uploads/1/3/1/4/131407668/0440d0ad9d.pdfIn PDF document text
    • https://site-1037262.mozfiles.com/files/1037262/sepep.pdfIn PDF document text
    • https://site-1036711.mozfiles.com/files/1036711/butafepotemewamazutig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2943/8370/files/rumebufurojugi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/5443/3183/files/mupadobevamavilapufijazuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6112/5013/files/39494492818.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/lefodifokarovir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCA 5420 bytes
SHA-256: aa79af03a8004282932e7df1ae2bb418c7fd6b5e7da66e003f3f50ba9bd2669a
font_01_sfnt_off00006f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4F 10124 bytes
SHA-256: 7f051e7c7a5b8a793ef2b21f60cd8460b031d217e24de91423d1023ecf47c3a1
font_02_sfnt_off000091e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91E7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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