Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4de38d5027b90ef…

MALICIOUS

PDF

33.0 KB Created: 2020-08-12 03:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4f8f4d6428f3f204c9977c33073831b0 SHA-1: d0fc1e508a19ef63ec7cb1a0a19d35301da277f5 SHA-256: a4de38d5027b90ef859d8d1bdafd86bc76da18d1de0caa6bc3cb6b37bc8e6698
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. Additionally, it exhibits a PDF link farm heuristic, with numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the malicious URL and a reference to a PDF download, reinforcing the lure.

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=aircraft+structure+book+pdf+download In PDF document text
    • http://tirorisew.scandinavianschool.be/uploads/1/3/1/3/131379732/wuvev.pdfIn PDF document text
    • http://fibar.happyvalleyanimalsinneed.com/uploads/1/3/0/7/130775403/9ab58703369.pdfIn PDF document text
    • http://gobafawiw.daveyoong.com/uploads/1/3/0/9/130969723/vegusaj_kemilupolebu_xotonifarokok_tirexoromupavoz.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/1/0432/8439/8246/files/mudebixitolovolebek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6215/6702/files/66112058805.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/97185002126.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5763/5743/files/cognitive_behavioural_therapy_for_anxiety.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/xetetomepuruwuzab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/gevujedibe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/6181/0076/files/wufigofivipaloviti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/77422655520.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0784/8096/files/autocad_full_course.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5815/1072/files/65736629151.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/arthritis_back_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/23677201856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7433/0517/files/gutunotokinowibadaw.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 1

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_off0000459f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x459F 5432 bytes
SHA-256: 7f4835eb882873368a28bf951dc770c49d7c70a20a2186bca111fab39d2eb66d
font_01_sfnt_off00005829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5829 9028 bytes
SHA-256: 51d85b62dad11faa374ac51661651c0c4159bbe8b2f945cead3bb7fd212adabb

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