Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e54610bc82f9a5…

MALICIOUS

PDF

52.8 KB Created: 2020-08-27 19:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 81a8d6a48fd17f9f2249b5564d9c7e72 SHA-1: cbe46a0dc5a09610f4a92b74256d5b4f80e66256 SHA-256: c9e54610bc82f9a5e5d9e4aac69c49deab3d8bc17ff46cb951877c96a4854ef9
234 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=aprender+calculo+diferencial+desde+c'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to drive traffic to this malicious infrastructure. The presence of many Shopify-hosted PDF links indicates a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=aprender+calculo+diferencial+desde+c In PDF document text
    • http://files.hooverdamnotes.com/uploads/1/3/2/6/132681415/9401551.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/1/0437/8791/1319/files/63266382422.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7460/7514/files/guviritexanekogiwajovu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/6006/0314/files/54759256138.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2834/0123/files/ford_420_tractor_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2788/9319/files/pokemon_platinum_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/95716472273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/muroxipabasubimelisatur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2033/6807/files/65960870722.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/16271095483.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/b_tech_malayalam_movie_songs_kuttyweb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/functional_analysis_problems_and_solutions.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 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84A0 5140 bytes
SHA-256: 7323b29bedd8c75aa2bdd469bdf033f22cffa2802c3d47d5b370059bcb8340cb
font_01_sfnt_off00009615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9615 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00009ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA3 12084 bytes
SHA-256: a8820ab3b0809a628306328b0564d2964b9082d39d6edfeb90b3098afd79a0b0

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