Malicious PDF — malware analysis report

Static analysis result for SHA-256 3affb876ed528724…

MALICIOUS

PDF

66.0 KB Created: 2020-11-16 15:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d80e3fe9d5b9e98fed3315aae455ad5e SHA-1: 3cd800a43e07282961fe41da8acde71f44bcef80 SHA-256: 3affb876ed528724d934cf9527c8353b85c8c34a022254073891ffe9794800c4
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to deliver a payload. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a visual download button and the embedded URL further support a phishing or malware distribution scheme, likely aiming to trick users into downloading an application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?utm_term=apk+smule+downloader In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f8ed41b6c05a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487623/normal_5faa3d0a47591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5f88b71cc1fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_5f97285f08840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5f987be14fe6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f8daf36b07fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_5f977b51ac5d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_5fa75e55464a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/91942ae9-8056-452d-a2bf-9e083bcd1e85/75157689937.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/celebrity_voice_changer_paid_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac4518e-b4b9-4081-bf0a-60e1461ce811/65239358599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56568b27-2679-447a-b8ce-f1c482c2d9c5/zadopixitigexefive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb52d960-b6a7-4f84-af56-bc5ec85fe317/18068221415.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_off0000c510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC510 5248 bytes
SHA-256: ccd2d7870eeae9fddb9a282fb6c04c72f9dc39f94515db60675e210d7b945662
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 10780 bytes
SHA-256: 5aa5d661f456678b1fd4a8c2e9c704ef65fddc793406536ef75374f4a85a8edb

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