Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ad739d5cfcd75b…

MALICIOUS

PDF

44.1 KB Created: 2020-08-10 17:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 931d95df0f836f90c0254f782c519c46 SHA-1: 733b373d70fdef5e5e48bd4e51114e180d0fbfd0 SHA-256: 78ad739d5cfcd75b16f8cc6ec0e9172aa94368dc0059e6c8a66aed7fe79a9431
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.cc) known for malicious activity. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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.cc/pify?keyword=certificado+mei+pdf In PDF document text
    • http://files.pictonlittletheatre.com/uploads/1/3/0/7/130739101/gebasepug.pdfIn PDF document text
    • http://files.swissblisstravel.co.uk/uploads/1/3/2/3/132303175/7711811.pdfIn PDF document text
    • http://files.joyellamills.com/uploads/1/3/0/7/130775223/wibofekow_gisolaveri.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/1/0431/7839/3749/files/abdomen_agudo_medigraphic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1811/5480/files/96499543484.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/lebojumokefatarozod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/27756317037.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6842/3330/files/27395330889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/hebrew_bible_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/pasetin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/xujodakiritu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1345/6550/files/divivoromaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/medicinal_and_aromatic_plants_of_nepal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/jipuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/97545570399.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0A 4996 bytes
SHA-256: 86efc059811d3adbc71b1ac13d9b7982edb2e867bcc7707c6cf91fc2e946a536
font_01_sfnt_off00007aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEB 12236 bytes
SHA-256: b1f026b2d026f15e0eacc4d5e1c9eccc690663d433a325588eae94212ec26300

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