Malicious PDF — malware analysis report

Static analysis result for SHA-256 28423ec18e543a6f…

MALICIOUS

PDF

39.4 KB Created: 2020-08-20 02:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fa37b7e0c1a974e1f0bda1c3ae6ddcb4 SHA-1: 48376bd5d0dd5001968770b180aba9099244eccd SHA-256: 28423ec18e543a6f051b6ab9a182cdc00dfadc90556496ba5d377391968b4cb3
194 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are part of a link farm, with one specific URL identified as a malicious redirector. This suggests the document's primary purpose is to redirect users to potentially harmful 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.cc/pify?keyword=builders+html+template+free In PDF document text
    • http://bokogu.oneindieone.com/uploads/1/3/0/7/130775166/62e3b728c4b.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/1/0432/3177/2835/files/23822352244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/vupazorazilodak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/98344144941.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9582/6336/files/27320644484.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/vovurokobazopusujapufakij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/story_views_for_instagram_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2793/1034/files/27792457322.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/journal_of_landscape_architecture_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/silekizezimepajetidomok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/32563310382.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_off00005c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8D 5328 bytes
SHA-256: 5ad9a72e693ec0b3f4fa4ff6d311064310eba05349142368d2062c893477e404
font_01_sfnt_off00006e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E81 10216 bytes
SHA-256: 1f21a748c8c793e7d865139c96f2656cebd8f03c9c833aab2dfc33da679e20b5

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