Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3520a0dacf2838c…

MALICIOUS

PDF

72.4 KB Created: 2021-01-16 22:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 44444e02654394e7a2614ceb040fdf8a SHA-1: 4b741d802767ab1e36b0c39b7ce4ae26da133419 SHA-256: c3520a0dacf2838c45a171387f8bc846e2480d92b6ff2fb2e7c02f0e29cfa17c
162 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it's a malicious redirector link, specifically pointing to a URL associated with downloading a 'battle camp monster catching mod apk'. The ML classifier also strongly flagged this PDF as malicious. The presence of a download button lure further supports the phishing and malicious download attempt. No scripts were extracted, but the primary attack vector appears to be a deceptive link leading to a potentially harmful 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/wb?keyword=battle%20camp%20monster%20catching%20mod%20apk%20download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4386618/normal_5fe3fe7689b67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451941/normal_5fabdb51cba9a.pdfIn PDF document text
    • https://cdn.sqhk.co/nivuduful/rN4hehf/ferazusaviwapubujoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_5fad9464514b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_5f8de260c5955.pdfIn PDF document text
    • https://site-1237331.mozfiles.com/files/1237331/bebufazunujagarusoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_5fecc8c63e164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366319/normal_5ff94c7f213b0.pdfIn PDF document text
    • https://site-1177018.mozfiles.com/files/1177018/bokadiwitut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_5f9cb80c84e2d.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/bKt4Rge/60572710715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_5fadc976cd708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5fdb6303e7a96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_5f9f3f7a500d6.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_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 5692 bytes
SHA-256: c50160368d255b5c1d9f54619bdcfc2ca423986281f09fc5170c38abd0a8bb36
font_01_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 10924 bytes
SHA-256: 2da7bf2869667876a7e13dd55fa421e11541a775064552aabf5eb0c462b4b774

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