Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb79b3e63ba8ec6…

MALICIOUS

PDF

47.1 KB Created: 2020-08-14 19:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c9511c8eb46e79fad3305e8b33df8a64 SHA-1: 56b072d2e019602ad725d1086ab4295d8b901cd0 SHA-256: 8cb79b3e63ba8ec6385d6c822338801b14672c78641fc1837280dd566a7e703a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a specific URL pointing to a known malicious redirector, disguised with a 'stony brook email format' lure. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a delivery mechanism for further malicious content or phishing attempts.

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.cc/pify?keyword=stony+brook+email+format In PDF document text
    • http://files.lovettadvisors.com/uploads/1/3/2/6/132695334/tuzetenozapevik.pdfIn PDF document text
    • http://nuxodego.orojoy.com/uploads/1/3/1/3/131383837/2750779.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/1/0429/6045/3785/files/wamudoba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/sony_scd-_ce595.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/xetefapip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9258/8184/files/armonia_cromatica_edicion_pantone_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/zaxijuferezowikul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/20489324647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/64741603614.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/jajinaduxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/83663713256.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevedizulav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/early_adulthood_physical_development.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_off00007769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7769 5144 bytes
SHA-256: 1750cdaacf5525b19fef966f8e4c067b6de4f66806057e48e922d62467dcd1fc
font_01_sfnt_off000088dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88DC 12056 bytes
SHA-256: 6252a00f5f1f07412a9ac4132efcecc4e69441fd9a289a86586be3369b0a2019

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