Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31ef193292f5c1e…

MALICIOUS

PDF

47.0 KB Created: 2020-11-05 09:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e3cf85d12ade329ba4ca4bc6b070775a SHA-1: 7ceac621af93e68ae32a4fc21291de045c70c244 SHA-256: f31ef193292f5c1e418bfb9c698fac2a27db0727e881086182002808cc21b915
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, pointing to the URL https://cctraff.ru/aws?keyword=sapphire+dragon+claw+quest. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure. The ML classifier strongly indicates maliciousness, and the presence of embedded links points towards an attempt to redirect users to malicious infrastructure for phishing or malware delivery.

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://cctraff.ru/aws?keyword=sapphire+dragon+claw+quest In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_5f9548eaa3417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_5f9d7df018ae8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409113/normal_5f9f88ed6aeda.pdfIn PDF document text
    • https://kigivalivago.weebly.com/uploads/1/3/4/3/134337689/nomig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xakapudakadu/kipotupaf.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/59318620962.pdfIn PDF document text
    • https://s3.amazonaws.com/kizuporowefib/73128820739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d92f323c-c01c-424a-b2dd-61aa7b94ac8e/vafesifileloxukuneza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e5e52bd-730f-4877-a836-01f1a0e3655f/63768794845.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/wunutugamabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12c08d6-ae1f-43ab-bddb-9b2aaa8c3ea5/pi_nin_yaam_trke_dublaj_indir_cretsiz.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/nesipefijunemorovopebeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b83f6a7-8aa0-4bfa-aa36-d627bdce7666/kivotepemafule.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69B5 5540 bytes
SHA-256: e7047670b522741e0eab6f4664f1be1b97edf671d8b4404333682f75b1c3c8f8
font_01_sfnt_off00007c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C80 11040 bytes
SHA-256: 3f806c2942183c7b74ee0e81d390b7a9b1ede37da9ba7d54f46d66b728af79e4
font_02_sfnt_off0000a100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA100 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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