Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52c735bf2b9ec54…

MALICIOUS

PDF

39.3 KB Created: 2020-08-17 17:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f6e874b789c0b0edef1aa3b74b168567 SHA-1: 676a886361a2a0b1618554a2037f4cfad84cb294 SHA-256: f52c735bf2b9ec54e2717ffcdc22f464e996c90dff0121b5a8dcfdbbae526276
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of links to other PDFs, likely for SEO manipulation or to host further malicious content. The document body contains text related to downloading uTorrent, suggesting a lure for software downloads. The ML classifier strongly indicated maliciousness.

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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.cc/pify?keyword=utorrent+free++cnet+for+windows+7 In PDF document text
    • http://files.thegraphitestore.com/uploads/1/3/0/7/130739117/4061410.pdfIn PDF document text
    • http://files.milinclinic.com/uploads/1/3/1/8/131857916/fapafisubemevuxis.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/1/0434/3706/4348/files/2006_jetta_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/vuriwigezadovokejoreba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4319/1960/files/apls_croup_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/74525949088.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/14937113852.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4409/1557/files/fupejonemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5233/5255/files/7547883555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5765/9560/files/lujibipalilur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3056/1447/files/java_avl_tree_implementation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0745/8975/files/mobefugelezojolepasixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6374/6465/files/77766362285.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8379/2548/files/6574219710.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_off00005d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D62 4936 bytes
SHA-256: 44f9b42125954345d62bd821e358c824874471f870cf28250730a04e6b95aa0a
font_01_sfnt_off00006e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5C 9960 bytes
SHA-256: 8e88d5e6aa17ad8716f69d6e3fb7fbf61607290ace1e971c48020ec603e3cfcd

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