Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb05ac3ebe2e9ad6…

MALICIOUS

PDF

71.4 KB Created: 2020-11-24 21:28:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ec5ca0f3d63734594a86b98ab8cd7ba8 SHA-1: e547f04c59da23ef47f72332ff6d03e2acf87842 SHA-256: fb05ac3ebe2e9ad68b86dcdbe4f41fa985adae52fa46bebfaba9a7fd74179082
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The embedded URL, https://cctraff.ru/strik?utm_term=cinco+de+mayo+birthday+quotes, is the primary indicator of malicious intent. The ML classifier and ClamAV detection further support the malicious nature of this file, suggesting it is a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=cinco+de+mayo+birthday+quotes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_5fbbb873c685b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5fb47dcb76a5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_5f98e38e6f1d4.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/e78638b1-6648-46bb-854e-3b1f0482caac/xebedikugevesedobafisuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/edred_thorsson.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/f150_transmission_fluid_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd8bf67-1288-46a8-85fa-7fc66ca10e1c/roblox_veteran_badge_picture.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/how_do_spell_slots_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148205f8-ede6-4ead-ac10-30143be1652d/44338055229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f54b8a1-831c-44a7-a1ab-ad2397cbf186/bisananudemoxulibekivaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3f0fab-8036-4eeb-8ccb-ab2649b8835b/balafatewadawoxorifub.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/ramadan_calendar_2019_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/free_movie_apk_downloads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c495b8bc-93ca-484a-a642-815cb8879716/zagaruxixumupaxi.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_off0000ce4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 5420 bytes
SHA-256: bb081f52e7133c9a6d18212d1b2f6db70e43af0aac0887efcb9f249d543f39f9
font_01_sfnt_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 9892 bytes
SHA-256: 296c4de8130b8facf4d25483519a8dc772949ae5b641bcc6cb9e385afba2564a
font_02_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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