Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ac388f2d73f396…

MALICIOUS

PDF

39.3 KB Created: 2020-08-10 14:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fd51874b975680f9658a1ed2bd2705fd SHA-1: 80cc47ef8b12619c3bff70253b8a6da98417228e SHA-256: b4ac388f2d73f396d6188b7cd64527955506dc0cd5df833171e7424db2a5313b
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=toss+up+rules+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicated maliciousness. The document body contains the malicious URL and other Shopify-hosted PDF links, suggesting a lure to download or view further content, likely malicious.

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/pify?keyword=toss+up+rules+pdf In PDF document text
    • http://files.wfrw.org/uploads/1/3/1/4/131453602/gilunumeru.pdfIn PDF document text
    • http://files.kennyharris.net/uploads/1/3/0/7/130775813/703c8ad.pdfIn PDF document text
    • http://files.youthattentioncenter.com/uploads/1/3/1/1/131164520/rinanib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/15149925766.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/avant_garde_theatre.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0453/3600/2715/files/pdf_file_merger_free_software_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/xexudunivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/anattalakkhana_sutta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/hiit_weight_training_program.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0097/7816/files/alternaria_species.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4762/3592/files/international_vaccination_card.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7102/8896/files/chiquito_team_band.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.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 4

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_off000050eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50EB 4424 bytes
SHA-256: 058bbde1f159ec27af7103fb2f2b331ef6c8f76bd4ca5aabff7e0ab27b2a8512
font_01_sfnt_off00006000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6000 10144 bytes
SHA-256: a1cb4a107421071618b98ee62c3855a21e03c92a2387bc721d735a167574e18e
font_02_sfnt_off0000829b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x829B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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