Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cc6bd612929933…

MALICIOUS

PDF

43.1 KB Created: 2020-10-31 06:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 58e23cc8aae7b6f7a69e9ff49a208f2e SHA-1: 24cd4c603ec7bac9b8668e1f8782ac39be0ba011 SHA-256: 19cc6bd6129299334b61ed58d93b79552a68bbc131c0b74dfccb9ae1fb10897f
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure impersonating Apple, claiming an unauthorized attempt to factory reset a device, and directs the user to a malicious redirector URL. The document also includes a large number of links to other PDFs, likely part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of a password-protected archive lure suggests an attempt to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/tugibob.pdf.
  • 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://cctraff.ru/strik?keyword=an+unauthorized+attempt+to+factory+reset+note+9 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5f95d1bf50260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5f8cfc6ce4170.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/tugibob.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/fa38f972-15a5-41f7-b018-550bf523228b/81825801078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901cafcd-e28e-40e9-a8ae-42a30bb88bcc/ropojerik.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/atmospheric_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a4678ab-c56b-433d-baa6-327f5f4e97bc/79277832765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56391a3c-0472-4089-8901-51529b5431c9/fupenewusiloji.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/19549791060.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/lowez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541beb6b-99e9-4010-a275-b52e36a8bf13/posimigipuliti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe11673a-c325-4c79-8862-e5aa9f1412ea/56054289151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcabd729-f812-4a1c-9ee5-25464ae36943/48942543610.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_off000068da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DA 5660 bytes
SHA-256: 2a9931b95e0a33756d20095370f6a4efedc8ea39e1da61d7aa3b5fe204e08d44
font_01_sfnt_off00007c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C02 10368 bytes
SHA-256: 3c6cdbd3aa3309721c5a195ffb6ec158ccc75e29d9353016d7d2f9ffcd2f230f

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