Malicious PDF — malware analysis report

Static analysis result for SHA-256 66552cf6efb9f04c…

MALICIOUS

PDF

67.8 KB Created: 2020-08-18 20:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e1610307cc98bd42b8b71d12f423136f SHA-1: 5b7694eb9fa06c6158263988cbb587ef91edc945 SHA-256: 66552cf6efb9f04c9a88bebb266a237a7c61de6ec19d4105921d6af7402583e9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a known malicious redirector, ttraff.ru, which is disguised as a manual for an Audi Q5. This indicates a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. Although no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious intent.

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=manual+instrucciones+audi+q5+2016 In PDF document text
    • http://files.mariannewardart.com/uploads/1/3/0/7/130775361/piforatoziwok.pdfIn PDF document text
    • http://files.fusaroconsulting.com/uploads/1/3/1/1/131163635/posejax_joguv.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/1/0435/3576/1562/files/free_printable_certificate_of_achievement_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/73792052170.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2869/8520/files/ceruleum_field_ffxiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/fujofaniturigu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/powokotaruwetuxurag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/automatic_transmission_gearbox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/fuzuwudaki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2908/6876/files/weragidi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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_off0000ab00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB00 5668 bytes
SHA-256: 59f7bf12ff288d927c09f1d04a87575b4d12ec1bf129124fd67b986d950a0be5
font_01_sfnt_off0000be5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5E 14824 bytes
SHA-256: aaccca40f480302b1415064b745369c35688b43948dd3e184e60a29de9520d85
font_02_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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