Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf66b5d70018f70e…

MALICIOUS

PDF

38.9 KB Created: 2020-08-07 21:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 316902590aba2217f23672980ee90292 SHA-1: 431af4d0ce48cbc78742abdbebccd1e3de9ecf18 SHA-256: cf66b5d70018f70eab0f1f0be5ba55d663a6a7a008a1a4ebe60dea5a7877817f
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to sheet music and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves enticing the user to click the malicious link, likely leading to a further stage of infection.

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=oceans+hillsong+united+sheet+music+pdf In PDF document text
    • http://files.ethridgedesignstudio.com/uploads/1/3/1/6/131606901/7301492.pdfIn PDF document text
    • http://teribe.avian.dk/uploads/1/3/1/4/131407178/disapuji.pdfIn PDF document text
    • http://files.yellowhouseherbs.com/uploads/1/3/0/9/130969160/53561dbf7b.pdfIn PDF document text
    • http://temegi.kierstenbrockman.com/uploads/1/3/0/8/130874254/1fb3d4d7723.pdfIn PDF document text
    • http://files.mysocarblife.com/uploads/1/3/1/4/131453465/bibemeden.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/1/0430/0944/1953/files/mafomir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5185/0647/files/women_s_weight_training_program.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/55694596294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6032/9637/files/45543311555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0179/1132/files/fiwitipumorowekosimatasi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7704/2325/files/bowivota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2117/1879/files/auditing_legislation_and_standards_2nd_edition_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/55849222687.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/nelibezuwarewamene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4945/9605/files/kinofinafisidepejisubi.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_off00004df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DF0 5500 bytes
SHA-256: be083a7a0246afb4ad360f10d3135f9218852f4a62964b45d6c770acfcafcd65
font_01_sfnt_off00006082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6082 14888 bytes
SHA-256: 7ac9dddb2ce3b868ad29ceb946c0ce35ae99daef7455324cdfafb6aa24a36cad

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