Malicious PDF — malware analysis report

Static analysis result for SHA-256 def2e54de3ce1515…

MALICIOUS

PDF

73.7 KB Created: 2020-12-28 14:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 28c9c870ef2909ef50d697bc89bc6536 SHA-1: 835391feb47486d6d6a0fcfd0b7c914ae21a24a3 SHA-256: def2e54de3ce15153e54c9347b88a4d9011a649ca9e27a85905e19851c8c3fde
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically targeting users with a lure related to downloading a game mod. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external PDF links suggests a link farm or redirection strategy to obscure the final malicious destination.

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://ggtraff.ru/strik?utm_term=download+game+tiny+battleground+mod+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_5fad85088a53b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453553/normal_5fc6f0fb1bd6f.pdfIn PDF document text
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/jebakiwekejaleroz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5fa9036015247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_5f923b4f468a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5f93cc34531f8.pdfIn PDF document text
    • https://sazigusejif.weebly.com/uploads/1/3/4/7/134771803/digizaselul_dogesepe_lubilaruzum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5fa6fcd6dcc03.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/c54357dd-7ea4-483a-bf52-2e75e29f1cf3/vugedatita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ed0999-13a1-4c2f-b7fe-205e5feda992/65024888588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719acc14-cbf4-4458-ac43-e26800b66f97/dalujelajujapejirisumurop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0842ab-5922-4485-b4dc-005a9da17cf6/fojamodarixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f1346f-59a3-4bd4-8225-d0c21b161945/test_de_temperamento_word.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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 5496 bytes
SHA-256: 3f5ff8882f6c712bef06df8fe70e419d37afaf8669ff23a2e52dfaad85ab2d31
font_01_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 10644 bytes
SHA-256: fc609e7add561adb19668d3b5e8c11cbcce163d766904461cd16ab1d13c1e7d4

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