Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf6ec104ddfe2b0…

MALICIOUS

PDF

72.2 KB Created: 2021-01-06 22:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 32884d879ea2270219a16260761a3b11 SHA-1: 40fdf985f8fb39b6728d5b8e57240a8b2fb11b70 SHA-256: 8cf6ec104ddfe2b00b28332e39a3609bb0d38446118bde85384c18000e05e187
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary URL identified, https://cctraff.ru/aws?utm_term=online+exercises+on+reported+speech+class+9, is flagged as malicious. While no scripts were extracted, the PDF structure and the malicious URL strongly suggest an attempt to lure the user to a harmful site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=online+exercises+on+reported+speech+class+9 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4410447/normal_5feb6ebcace78.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/GUhigfW/fidelenavowivobuledowane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_5fb60ca8b1cce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5fc569dda1f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5fb8361610104.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwalimo/hKDAgic/r_word_wallpaper_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/e7hirgh/balutuzivedis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5fd80cb2b8e3b.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/jasadavebaga/anghami_apk_mod_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/95889393115.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/material_design_admin_template_free.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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 5412 bytes
SHA-256: 43800e5df710abe8ad4d08228855f1cb0f4559ea718fed6125b1a77bdd55463a
font_01_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 10408 bytes
SHA-256: b147a8e161c78940de5ff53a9c20901044a11abd1fb8cc69b1509547a00acfb3