Malicious PDF — malware analysis report

Static analysis result for SHA-256 851623afe9af2582…

MALICIOUS

PDF

39.2 KB Created: 2020-08-09 11:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ebb7510bdefaf7ccf2ceabf3c43f3fd5 SHA-1: 1be65f438e8f2c47bfc4fd469ed8b55f10c4bbc2 SHA-256: 851623afe9af258257791f7b8fb1139c8e4a1e910cbfcb4558377dccb78a9774
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirection and SEO link farming, pointing to a phishing or scam attempt. The embedded document body text and extracted URLs confirm the presence of a redirector link designed to lead users to potentially harmful content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=amplifiers+comparators+multipliers+filters+and+oscillators+pdf In PDF document text
    • http://wifop.patriothallsc.org/uploads/1/3/2/7/132740405/4244205.pdfIn PDF document text
    • http://files.nwutwincities.org/uploads/1/3/1/6/131606819/b5c5901a9575.pdfIn PDF document text
    • http://files.southwestpaddlecompany.com/uploads/1/3/1/1/131163516/340899.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/1/0429/8607/8369/files/fajobemiwesol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/9004/5080/files/merge_sort_algorithm_in_java.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/bad_company_feel_like_making_love.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/bahria_town_karachi_balloting_results_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/rewepupibosorebefewuziwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/52373950126.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4197/2636/files/fusionner_des_documents_gratuit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8510/3258/files/34055314450.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/13598602036.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/josuzafegeda.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 2

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_off00005257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5257 5288 bytes
SHA-256: 72a306f291f6108892760eff02416098802b8d679ddb837ca90f8db2ee14c9ee
font_01_sfnt_off0000643f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643F 14008 bytes
SHA-256: 4874cb9d4fa5946e1e9cac2c41b0618ed962424d7a604455e46503c2b83f3e34

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