Malicious PDF — malware analysis report

Static analysis result for SHA-256 a140c77a1347a143…

MALICIOUS

PDF

43.8 KB Created: 2020-08-06 09:39:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 559c712407cdf96eec720601abde05f0 SHA-1: 99adc4ae2bc6ec5a72d662d3290be3086b287925 SHA-256: a140c77a1347a143471b3e775198ef90eb9ab5be5817ddd562c4e3fd9a9d200d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, a technique often used to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector, 'ttraff.ru', which is disguised as a service manual. Another heuristic flagged the PDF as a link farm, with many external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of these link farms and the malicious redirector indicates a social engineering attack aimed at driving traffic to potentially harmful websites.

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/wb?keyword=yaesu%20ft%20857%20service%20manual In PDF document text
    • http://files.ashleighcaudill.com/uploads/1/3/1/4/131407492/5baac3530c42.pdfIn PDF document text
    • http://files.evoshieldcanesscott.com/uploads/1/3/0/7/130740255/5920872.pdfIn PDF document text
    • http://files.highlevelstore.com/uploads/1/3/1/4/131406086/8216058.pdfIn PDF document text
    • http://files.orffervandermerwe.com/uploads/1/3/0/7/130775434/1034322.pdfIn PDF document text
    • http://moginituz.bmocwins.com/uploads/1/3/1/4/131437363/lezorironija.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/1/0433/0687/7080/files/zexula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7977/8979/files/kisufewoberixifiva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8704/4515/files/juviwozetexuna.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62092070186.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/36108854908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3503/2737/files/76161979091.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/zexejagisutiluzel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7197/7110/files/wii_u_mii_qr_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2795/4840/files/patient_care_technician_study_guide.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 6

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_off00006075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6075 5444 bytes
SHA-256: 00b78a02eea5acca860f9ce965ad33122a7637b01cebad7eafc1469054f26c31
font_01_sfnt_off000072fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72FB 15372 bytes
SHA-256: e7662047a7b094d9f4a3ad52727ee7282407046652df45c743a2334c59d53c19

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