Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bcda7ee9751675…

MALICIOUS

PDF

43.0 KB Created: 2020-08-04 05:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a121f5d10edde9c29e730de7c2ceacfb SHA-1: 83630fea8d0d5ae5e59a0611672613c7ff12c486 SHA-256: 84bcda7ee9751675f77ebd9441e15dd7bcf823a9d55766479ad4f7baa8f1a108
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, disguised as bookcase instructions. This is supported by multiple heuristic firings indicating malicious redirector links and an SEO link farm. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL which is likely used to host or chain to further malicious content.

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=mainstays+3+shelf+bookcase+instructions+pdf In PDF document text
    • http://files.jlgpublishing.co.uk/uploads/1/3/1/3/131380971/18be3427427f.pdfIn PDF document text
    • http://files.verifiedpress.org/uploads/1/3/1/1/131163599/580d897.pdfIn PDF document text
    • http://files.geo-mac.com/uploads/1/3/1/6/131637190/guvax-pufukotidiw-zamaxeput-lagunukaduzamez.pdfIn PDF document text
    • http://files.shedfield.com/uploads/1/3/0/8/130814115/616796.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/1/0429/1851/0745/files/61421265262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/96667738711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6532/7262/files/2880601815.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7610/8956/files/24008055484.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/xajogikovadar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6326/3910/files/molew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/24343820569.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/forum._cheatengine._org_viewtopic._php_t_585234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/blank_html5_page.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 6

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_off00005640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5640 5600 bytes
SHA-256: a54fe06ca9e5aab26f556892c91e262524d66580d4dbc7277d1822eec148e5b6
font_01_sfnt_off00006939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6939 11144 bytes
SHA-256: f64405c0861afb922d874791d0c3ba873699c76e54889a56a2b1ada426c713b1
font_02_sfnt_off00008f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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