Malicious PDF — malware analysis report

Static analysis result for SHA-256 40341d8e3d43d057…

MALICIOUS

PDF

45.2 KB Created: 2020-10-25 15:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9c707eeaa4d5eb57e3600a8374c14e63 SHA-1: ec1d1e4f58e4c6683c1ee50af812906e5b199276 SHA-256: 40341d8e3d43d057e204963a836de1f119ea01388249b123d91bd56faccd30d7
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The embedded URL, 'https://ggtraff.ru/wb?keyword=reduce%20reuse%20recycle%20printable%20worksheets', is the primary indicator of malicious intent, likely serving as a lure for a phishing or malware distribution campaign. No scripts were extracted, but the presence of a malicious link is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=reduce%20reuse%20recycle%20printable%20worksheets In PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/05fa486.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/5865603.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/1/0436/5506/9849/files/summit_high_school_la_quinta_ca_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0927/1702/files/gameved.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1147/2064/files/pivadonanoj.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/kabosuwavonedijipusazaw.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/95784515755.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2428/3296/files/80957641044.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1007/9898/files/15793304163.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/kegepuziwuz.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/argala_stotram_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/89159423057.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/4154464683.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/wolofep.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_off00006fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAE 5568 bytes
SHA-256: 6bb2d3f1d94f907844fc3982457d321ebede0120044b02e059a5cd6c307dbde0
font_01_sfnt_off0000829d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x829D 11004 bytes
SHA-256: 77e624ce0d0b69ba8bfc16cfd195e7d3b1ac5aa48088ac0d6b7604dde024f855

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