Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc20ef6ca7d135b5…

MALICIOUS

PDF

73.7 KB Created: 2020-12-24 09:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 12a2811a8d5d605fdb5f252cd62b5225 SHA-1: 96de131935ba5e92a0d846eb02b15c8021db7514 SHA-256: cc20ef6ca7d135b5bc8bee161b25394857cbc69617406d7054bedf598e62efc2
214 Risk Score

Malware Insights

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

The PDF file contains critical heuristic firings indicating it links to known malicious redirector infrastructure and a large PDF link farm. The ML classifier also strongly flagged this file as malicious. While no scripts were extracted, the presence of malicious links suggests an attempt to redirect users to harmful content, likely as part of a phishing or scam campaign.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=last+watch+together+pc+split+screen In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5f906bf78c7f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5fc0ca769197e.pdfIn PDF document text
    • https://lekinowi.weebly.com/uploads/1/3/4/4/134476644/08162.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/drfhgBk/battle_for_the_galaxy_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_5fc3832f56bb7.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/xabalaru/cerebro_humano_e_suas_funes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e7b78c-151c-4cd8-9f7e-31228fe570be/20896897690.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/10826408657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b05f6f-d0ef-452e-8ece-632d45231dcb/81416866627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90707d1-2adb-45a6-916e-5ff5d2995bed/mirika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c580fc13-2343-4c46-8955-c9b48d7867f9/15151838649.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_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 5228 bytes
SHA-256: 34721270caf3b81cb76a7c8b6b9fce68c465a0a11b9384c4384ac8e2ef19de96
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 10820 bytes
SHA-256: 052011ec4945c40f7c2f6812125bc3460da654e58c63f11d598712d38c23c89c

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