Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c545d6404b98988…

MALICIOUS

PDF

31.4 KB Created: 2020-11-04 01:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a1d12444298de7eec400a6df152642a8 SHA-1: 2b68104a2c6f22561917636c8655e5125a9d4ec1 SHA-256: 3c545d6404b989885b40580c1bf676c38579d91476b046db57a3ecd7c8982412
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified as a redirector for free-download phishing. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to trick the user into clicking it.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/123?keyword=element+tv+elefw248+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5f96e308c84dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5fa1c5f64984c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5f9f3b0a8b977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f91f8f466104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f8800913cd60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f873f520849d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419645/normal_5f9a05195567c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f95862d07550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5f9f239bb0589.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sukedil/gurusuzukukax.pdfIn PDF document text
    • https://s3.amazonaws.com/pedokeza/pabemuzolomozal.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/66538937943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c2b806f-c74a-41b9-9950-0b894a5a8e40/21104557797.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000424c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x424C 5160 bytes
SHA-256: 0c997bf4fc857157657fad1d464bd1208dcca7e6c474205d5d85a6fa0631c5a5
font_01_sfnt_off000053eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53EB 8592 bytes
SHA-256: e4af1a21aea3a0f0e5c292797a8d267cb4af44157becd9c43a242f1661394381

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