Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4afce8051ebe76…

MALICIOUS

PDF

73.9 KB Created: 2021-01-04 21:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 68d69652c518359b02b5347d78cd7cc1 SHA-1: b4823663664c781c76f164ae2763717be24c83b1 SHA-256: aa4afce8051ebe762f52b429d89a1c7a2c4415ef3dd95e6be665807be58f6abc
294 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Tampering

The PDF file contains multiple links to external resources, including a known malicious redirector, disguised as a KMS activator for Windows 10 Pro. It also contains instructions to disable security software, indicating a clear intent to bypass defenses and potentially deliver a payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gettraff.ru/aws?utm_term=kms+activator+windows+10+pro In PDF document text
    • https://cdn-cms.f-static.net/uploads/4484618/normal_5fbb4b2d62fd4.pdfIn PDF document text
    • https://cdn.sqhk.co/rigowodikot/ipWhiXv/31567115615.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_5fcef98db9d83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453344/normal_5fe45faebad2b.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/59317a92ad135f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_5fd9972df11b9.pdfIn PDF document text
    • https://velizixevapejaj.weebly.com/uploads/1/3/4/3/134376636/8584010.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/7hcpYt3/gonovaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5fc04fa627938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_5feaf2d0ed934.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/dinilederu/dying_light_platinum_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/wimodanamaxojawizazuza.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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 5500 bytes
SHA-256: c57b53086d8b7bdcb46099efa09c320a3cc8c4aa42f1b8de6160eeea03649f93
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 10016 bytes
SHA-256: 55969e4154c8bcd2709edeb0645258d6e1f9c23ea53c0c5f41feb87e4b23f3b3

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