Malicious PDF — malware analysis report

Static analysis result for SHA-256 5531df9ae62daddc…

MALICIOUS

PDF

59.5 KB Created: 2021-01-12 06:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: faa0d9e14a5cd7120332a7b16e1cf5d5 SHA-1: 68607a2720a98c75067a31dc60ce7bd7b5c4188e SHA-256: 5531df9ae62daddcec7b758e7acb9ff0f04356f0eb58c9e0fff5777be3108433
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=austin+statesman+obits+2018'. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the presence of a malicious URL strongly suggests a phishing or malware delivery attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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/123?utm_term=austin+statesman+obits+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_5fe845c25850e.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/fiaghhz/robidajemisi.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/lavJVjj/lone_rider_motobags_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5f94b7f0bda62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426699/normal_5febf9404bb24.pdfIn PDF document text
    • https://cdn.sqhk.co/tizudukokeni/R2iaG94/hide_and_seek_minecraft_mini_game_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5fe2f11e65434.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384647/normal_5fdde278f1d60.pdfIn PDF document text
    • https://cdn.sqhk.co/gekobegij/VQ58dmv/hairstyles_for_men_with_short_hair.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418584/normal_5ff96ac154ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f884fc148078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fb431931886d.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/hhM1jcV/my_cloud_local_login_url.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ad7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7D 5352 bytes
SHA-256: d66523e02f62c29b1d6705480f6322149fef700cb4fc555dbcf2503db0453d27
font_01_sfnt_off0000bfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA4 9860 bytes
SHA-256: e1a064052a89abd0fc6354b640479f23827e64f2fb2ec4e9718816d2e98d96dd

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