Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7c131a49ee99ac…

MALICIOUS

PDF

47.6 KB Created: 2020-07-30 16:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9f2ece6bf3e2734b41726d7fcf20e8dd SHA-1: a0103264cc5c25cf2e8b6a91a32583debfea9f7c SHA-256: db7c131a49ee99acdcd08756fd397203b046db0f29c9729489593032b9296319
194 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm. The primary malicious URL identified is ttraff.ru, which is known for redirecting to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of numerous external links, including the malicious one, indicates a likely attempt to direct users to external, potentially harmful, resources.

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=callan+method+stage+12+pdf In PDF document text
    • http://files.drcarriebrennan.com/uploads/1/3/1/6/131606111/wivavudujizu-pelidu.pdfIn PDF document text
    • http://files.isrwintersprings.com/uploads/1/3/0/7/130775084/dogozuvaxew.pdfIn PDF document text
    • http://files.humphreyhummingbird.com/uploads/1/3/1/1/131163658/9892837.pdfIn PDF document text
    • http://files.mooserange.com/uploads/1/3/1/4/131406558/pepox-joxakapobari-gaweda.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/1/0434/0688/5027/files/93348590528.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2075/3823/files/nibokoripowutunofibumora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1465/1038/files/dokeka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/ravewemolanenoku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7556/7777/files/losakib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9342/5316/files/piloxujokojuvomixiwip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7354/9974/files/32685257298.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85286147205.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/ferukavuwapoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/zefafajorebep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4352/8599/files/62752867652.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_off0000782d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x782D 5308 bytes
SHA-256: 22b7d9fa0fb577bc3d9b42cb46fa4d4332a099a8976fa3d6668551c6cfa9d46f
font_01_sfnt_off00008a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A21 11396 bytes
SHA-256: da036744f8aabc83b6fd215bc59560bf67a15fb4305468ea068495e1b859c498

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