Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1bb77b0c1d5520…

MALICIOUS

PDF

58.9 KB Created: 2020-08-08 09:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d1146ec5e1322aa1104aedbf8f079cc2 SHA-1: 86e0c86a1e38067f7f1383497f2c4f2f6fb30531 SHA-256: cb1bb77b0c1d55204a7b87532f787a94abb57140b345f67f4d639ff141b63ea5
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to potentially malicious content, masquerading as a document about environmental conservation. The primary malicious indicator is the redirector URL, which is known to lead to further malicious infrastructure. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which in this case appears to be a lure.

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=conservacion+de+los+elementos+bioticos+y+abioticos+pdf In PDF document text
    • http://files.iamlegacy.net/uploads/1/3/2/7/132740435/8245398.pdfIn PDF document text
    • http://files.nataliekosnar.com/uploads/1/3/0/9/130969686/pixonimawudip-xolixib-rujopilefenitol.pdfIn PDF document text
    • http://files.breannpattyphotography.com/uploads/1/3/1/4/131438190/fuxoxipugojigew.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/1/0429/6084/7004/files/malaria_treatment_in_pregnancy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/24525679909.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0821/9560/files/63319908311.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5304/6165/files/learning_pencil_sketch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0133/1364/files/hannah_arendt_eichmann_in_jerusalem_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/silixogexazowitakupav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/natilesepaniwejer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/78340915065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7232/9630/files/pueblos_de_puerto_rico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/7757237163.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 5

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_off0000a615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA615 5508 bytes
SHA-256: 17ffe5a2641058e86ff545600b043d0c820aef4ff264cafe67aefb1b1f85dba1
font_01_sfnt_off0000b8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BE 11072 bytes
SHA-256: 64e225fd5cd67556da55f38882d2e5e01e6266efbf2646f66cc5869da2e32c39

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