Malicious PDF — malware analysis report

Static analysis result for SHA-256 16735ae8a10f7ff0…

MALICIOUS

PDF

58.2 KB Created: 2020-07-30 03:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5143613bd932c340a94e8ba04a34aa1d SHA-1: 695ba1ddace41f524c6753f92933122afb099d37 SHA-256: 16735ae8a10f7ff08953f35b799effb3f7e6e81b8e61b5ecaf807978ffd2571f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to redirector infrastructure, specifically `ttraff.cc`, which is flagged as malicious. It also hosts a large number of external PDF links, suggesting a link farm designed to attract search engine traffic. The document body, though heavily obfuscated, contains metadata indicating it was generated by `wkhtmltopdf`, and the presence of malicious redirector links strongly suggests an attempt to lead 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=resultados+de+un+sistema+de+calidad+total+pdf In PDF document text
    • http://files.gcclittleton.org/uploads/1/3/1/4/131453867/2240f6.pdfIn PDF document text
    • http://files.hello-baby-toys.com/uploads/1/3/1/4/131453807/4352687.pdfIn PDF document text
    • http://files.futfemuniversal.com/uploads/1/3/1/3/131398246/1427613.pdfIn PDF document text
    • http://files.eastviewpets.com/uploads/1/3/1/3/131379312/195162.pdfIn PDF document text
    • http://files.fancydollfacepersians.com/uploads/1/3/1/6/131606782/01f1cdde66db.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/1/0428/2449/9367/files/bibowutedat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3762/9348/files/ginizunutiba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4574/6848/files/48442561628.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5281/0911/files/gerates.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5602/9093/files/8564365566.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/52250119916.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/16078321250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/lepujuze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1061/2644/files/bufosoluvisisalobiwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/netepazabefi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1289/8461/files/xofoxatudolipu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7025/9357/files/wopuzigubutuwepugerulixi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0379/7916/files/74014658794.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5C0 5092 bytes
SHA-256: 5a79b2dd03e2ee49de4ff54869ae5d6460e679617b8d005c5720463feb7d8d00
font_01_sfnt_off0000b705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB705 10944 bytes
SHA-256: 74ec9569c955ba0994b914b5dbc86af4d414912e53a66aa494c6382a82066dc4