Malicious PDF — malware analysis report

Static analysis result for SHA-256 77653399fd72cfe3…

MALICIOUS

PDF

39.5 KB Created: 2020-08-08 09:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 76b6068cdb7ded386896cda6209a8be5 SHA-1: 9afbd639e20116efffd08de9c2a155b5c3ccc3a1 SHA-256: 77653399fd72cfe38f24b57ad2bdcd80cf6b147f885972cb9e6304f1cec950ea
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a malicious SEO link farm, disguised as a cost accounting PDF. This is supported by multiple critical heuristic firings indicating malicious redirector links and a link farm. The embedded URL and the document body text both point to the same malicious redirector.

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.com/pify?keyword=cost+accounting+multiple+choice+questions+and+answers+pdf In PDF document text
    • http://files.pierceshearer.com/uploads/1/3/0/9/130969204/xigubavudapabalakin.pdfIn PDF document text
    • http://files.doubleeagleadvisers.com/uploads/1/3/2/6/132683328/fetixewomepojis.pdfIn PDF document text
    • http://files.emilybridghamportfolio.com/uploads/1/3/0/7/130775427/fixamofowo-rifesotidebikol-peluzivif-limoti.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/1/0438/5108/8032/files/brad_paisly_celebrity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3242/0264/files/all_important_dates.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/56992383773.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/67201159931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6177/2442/files/vizedi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/domamusuvusuzexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8732/2522/files/60508005026.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/34073710273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/58510777289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/10271517421.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 5

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_off00005c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C14 5692 bytes
SHA-256: 2a4d30808cc3bd8e182c21acefd060e568456a2982353f9c37e3b9265c959f6a
font_01_sfnt_off00006f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4F 9896 bytes
SHA-256: ad403d8e3267021977be500dd4e795b884b149bd620f305f0894c775d0cfee6a

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