Malicious PDF — malware analysis report

Static analysis result for SHA-256 50287502d2d0b606…

MALICIOUS

PDF

70.1 KB Created: 2020-11-20 10:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 303d6417718aa9df7616b9e2d2f35d39 SHA-1: e04c78fd7cd236197c703aa9b17e677574a726cc SHA-256: 50287502d2d0b606ff5fcd083c72c3d5356e651616e9d144fdf24d08b179250f
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting an attempt to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded links, such as 'https://gettraff.ru/123?utm_term=b+flat+blues+scale+bass', are likely used to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=b+flat+blues+scale+bass In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f95f86881432.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/8929746.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/lapupevomelifedijas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5fa3eff5532d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464874/normal_5fa4f80ce656d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420905/normal_5f988259003e0.pdfIn PDF document text
    • https://sulajaxa.weebly.com/uploads/1/3/4/3/134362611/05e4303b9dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f962dcf0cdef.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://uploads.strikinglycdn.com/files/47b2d8ca-1945-4208-97a8-86dafa111019/fort_bragg_middle_school_fort_bragg_ca.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/adobe_acrobat_convert_scanned_to_text.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/1080_ti_vs_2080_ti_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/manifest_destiny_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b9f2830-b98e-4f22-be48-ee35547a6dab/mafivegibabatedexejo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA42 4588 bytes
SHA-256: 676ef3cba753432c1782d3a3e1cdb47e8b195aec22005e3144ba8aeeb0395dad
font_01_sfnt_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 10316 bytes
SHA-256: a39cc4f2654c9a4a01752e281f96b7c98cbf1121924b75fb9f505d56895e12c5
font_02_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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