Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58c85a8bb94a640…

MALICIOUS

PDF

40.3 KB Created: 2020-08-16 12:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f4d0d89bb974ad796906e3c78d74172d SHA-1: e7563313211af4fd87d6b1f49f3fe4f33c6ca727 SHA-256: c58c85a8bb94a6404fe2b7ec4067c7ecd4843ffc0dc9b698885ecd1fb1e7e3c0
194 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One of these links, 'https://ttraff.com/pify?keyword=pulmonary+hypertension+classification+guidelines', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is a primary lure. The presence of a link farm indicates a likely attempt to distribute malicious content or conduct phishing operations.

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=pulmonary+hypertension+classification+guidelines In PDF document text
    • http://files.marcdurand.net/uploads/1/3/1/3/131380308/cbc6f0c.pdfIn PDF document text
    • http://files.jaxwoodworkers.org/uploads/1/3/2/3/132303270/c34aa6.pdfIn PDF document text
    • http://files.amaefresnomadera.org/uploads/1/3/1/4/131407233/pululetarogir.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/1/0428/9835/8432/files/71061356311.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6436/1113/files/15868254037.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7154/5237/files/84118091133.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/beginning_node._js_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/puwelexipusijogerikufez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/56438328453.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3490/1671/files/xopofotizoruralo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0486/0328/files/celebrity_rehab_presents_sober_house.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6655/5557/files/biluwodi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0941/7127/files/53648222015.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 7

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_off0000609a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609A 5672 bytes
SHA-256: bbf8d1c4791bbafd32d01e1d63d9ec592600a32991ed54b1fb353f8bfbbef248
font_01_sfnt_off000073b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B9 9548 bytes
SHA-256: a664fc8d92322e3156f3aba45618e32794570c1ab09f290e5d5b6a52970c247c

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