Malicious PDF — malware analysis report

Static analysis result for SHA-256 71893a7aa14de9ee…

MALICIOUS

PDF

33.6 KB Created: 2020-08-01 17:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4aa8051812d92ab4d2b24a477d9fd43e SHA-1: d2d8e92e6c3dfe4bbe4354b603e55264a39152da SHA-256: 71893a7aa14de9ee446f81e59ee74be56e413b469c19e42d9c0491d150e1fa3d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to a redirector service, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the heuristic firings suggest the document is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution.

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=kenmore+glasstop+stove In PDF document text
    • http://files.playandlearninstruction.com/uploads/1/3/0/8/130813531/3033797.pdfIn PDF document text
    • http://files.brewtonfirst.org/uploads/1/3/0/9/130969435/kurinivafixunav-nuwoduve-lifowas-gopuv.pdfIn PDF document text
    • http://files.qualitypreparedmeals.ca/uploads/1/3/1/8/131871740/423839.pdfIn PDF document text
    • http://files.mywynfield.com/uploads/1/3/1/4/131453907/ede2ea4adde5a.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/1/0431/3173/2132/files/xanirowemenovubalemaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/rerunajosami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8453/0343/files/malayalam_mallu_katha.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0055/1830/files/20296948619.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/33113218210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3016/7202/files/57407558006.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/14658038712.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/pijadafe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/dakituxasasire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3634/2434/files/kinekijedusirofudis.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 7

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_off0000484c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x484C 5168 bytes
SHA-256: c5810a59c9d09a9437b7b33cf889120698c6a47d32df06f9b194e731b41d4812
font_01_sfnt_off000059d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59D8 9440 bytes
SHA-256: 6a0843680646f74de31c14df4a07ad89b46a874901a713953a0af96d0ead1c53

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