Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ca127a48950262…

MALICIOUS

PDF

39.6 KB Created: 2020-08-06 11:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9cb62c100cde7ef3aed731e84c3cda24 SHA-1: e305b95af04752bd967d370810b8363adfdd812c SHA-256: a9ca127a489502621da68374b30435db5055868a86d2fb255bb384e87136b13f
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=castle+risk+rules+pdf'. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to benign Shopify URLs but likely serving as a distraction. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering via a deceptive link within the document body.

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=castle+risk+rules+pdf In PDF document text
    • http://files.almeria-estates-and-realty.com/uploads/1/3/1/4/131437351/fefozo.pdfIn PDF document text
    • http://givodu.farmtoartfun.com/uploads/1/3/0/8/130813108/metuwewo.pdfIn PDF document text
    • http://files.pink-backpack.com/uploads/1/3/1/4/131453114/borulazara.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/1/0431/9451/5614/files/honeywell_thermostat_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/7576927167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/75757728009.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/dojulidiwuxunajopabobajex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7437/1235/files/92652049141.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6356/5727/files/xopezunikifogotutujuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8857/6661/files/nuwexotaronisebilefoven.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1917/9931/files/17178364357.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/jedenepumigijezu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/43704704247.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_off00005e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E93 5004 bytes
SHA-256: 8880e1cda24a20358de7d2069d202cf31dd8abff5cdf391e9da1d3e3927b9c92
font_01_sfnt_off00006fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA3 10104 bytes
SHA-256: d9471f44160a70e02f049968881cc29dbe69815d260296e6ec092ce8aa09f961

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