Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ecfb9d8a82c428…

MALICIOUS

PDF

38.2 KB Created: 2020-11-02 11:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8862cca6af6ab83eec36fb23467be687 SHA-1: dc7fc820f990e11d31c87206b55727d91d81aa7b SHA-256: 78ecfb9d8a82c428e3e289eba42bc4772328c2e02b027341b028b4bab4464554
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to external PDF files, indicating a link farm. One of the primary URLs, 'https://ggtraff.ru/strik?keyword=truyen+tranh+doremon+mau', is flagged as a malicious redirector. This suggests the document is designed to redirect users to malicious content or phishing sites, potentially for SEO manipulation or to distribute further malware. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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?keyword=truyen+tranh+doremon+mau In PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/4952957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_5f973347d5829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1360/1943/files/jowediwapuzur.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/43101612953.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5031/9528/files/street_fighter_apk_android_2.3.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/5046147115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc69247-c70e-427f-854c-d09ebcae85f2/91607758402.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/24386531904.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/38132197944.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/mad_skills_motocross_2_hack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7602/6522/files/searsport_high_school_baseball.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_off000058b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58B2 4908 bytes
SHA-256: d0bbd986a2ec1852667155ca3cbe41d1e822ac19e604199df5869c2c014d1ba4
font_01_sfnt_off0000693f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x693F 10544 bytes
SHA-256: 4df393ce553c58ddaccb3ef57e41f5bb938b7cb24a259181d06613a942b66e76

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