Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdf14f4e1717e27…

MALICIOUS

PDF

37.3 KB Created: 2020-08-24 06:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 40297f2c9bfdbe356fb6ad5850cf0b74 SHA-1: 8805a16bc7f3ab562883f25b66b92600947ed6cd SHA-256: 8bdf14f4e1717e27d5ba36cd81656d35128dc799cd7479c0a88c60a66d9c6b22
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to potentially malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.com/pify?keyword=biomes+reading+comprehension+worksheets, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, contains references to the topic of 'biomes reading comprehension worksheets' and the malicious URL, suggesting a lure to disguise the malicious intent. The file was authored using wkhtmltopdf, a tool sometimes used to generate malicious PDFs.

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=biomes+reading+comprehension+worksheets In PDF document text
    • http://rozofu.katekinsey.com/uploads/1/3/1/6/131606289/1cc7c9daa0.pdfIn PDF document text
    • http://files.brianasamuelson.com/uploads/1/3/0/8/130814101/3677b01.pdfIn PDF document text
    • http://vaseleb.bhawkeyephotography.com/uploads/1/3/0/8/130814328/levus_ritukovidu.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/1/0431/7508/4193/files/brown_dust_ogdoad_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2504/6431/files/path_dependence.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0595/8565/files/65024546778.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/free_fax_cover_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/macmillan_mathematics_3a_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6382/6840/files/javascript_tutorial_javatpoint.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/55954198130.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8347/2802/files/rupakuzabavozopewuminir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6127/1959/files/30963310048.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8450/3453/files/bet_adsorption_isotherm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/virujosivupekejoxakitalin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/vosikapozutofaxej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/vopogixi.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_off00005223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5223 5660 bytes
SHA-256: 1a9920032994c43fda98d4700a6e5601786fc927f17403caaf199cbaeb025b62
font_01_sfnt_off00006544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6544 10200 bytes
SHA-256: cf0655b6f17d1a56c825b27c383181e967893c8d770eaa86bd914c1a5d002669

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