Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21ba17bc423d21d…

MALICIOUS

PDF

37.7 KB Created: 2020-08-24 23:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cbfdd34b2f2ce2c3f826f471b1ec5985 SHA-1: 08ae630a9deb51cfdd639c55c8126fdcf9130dc3 SHA-256: d21ba17bc423d21df1cb787225c965af6221f57cf073183d17ba798adf2380eb
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the same malicious URL. This suggests the primary intent is to redirect the user to a malicious site, likely for phishing or to download further malware. No scripts were extracted, limiting the analysis of specific execution behaviors.

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.ru/pify?keyword=antithrombotic+therapy+for+vte+disease+chest+guidelines In PDF document text
    • http://vedef.nortonparkproperty.co.uk/uploads/1/3/0/7/130740387/aa3b3525e3.pdfIn PDF document text
    • http://nozokabe.joychoquette.com/uploads/1/3/2/7/132740669/8655c60fcdf.pdfIn PDF document text
    • http://fiwavaze.picacookie.com/uploads/1/3/1/4/131483281/fofoz.pdfIn PDF document text
    • http://files.haleythestoryteller.com/uploads/1/3/0/7/130738790/08a84b35acd.pdfIn PDF document text
    • http://files.kphotoandfilm.com/uploads/1/3/0/7/130775462/1980747.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/1/0428/1283/3959/files/belisizir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/ejemplo_de_brief_publicitario.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/transcortical_motor_aphasia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3343/5032/files/free_dale_carnegie_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/breast_cancer_articles_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/jujudiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8229/3141/files/vosewux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1565/9942/files/funetemusunepanujane.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 4

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_off0000541f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x541F 5860 bytes
SHA-256: c5b0c071c6279ac82e27101eec22194c1c80e36ac743ba81a6cbede28b247250
font_01_sfnt_off000067e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E2 9860 bytes
SHA-256: 039afd16f19411ce484e839a53a0fa8d1744f7186aa19a2a2775cbaa81e4795d

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