Malicious PDF — malware analysis report

Static analysis result for SHA-256 807330fc27d5b55b…

MALICIOUS

PDF

50.4 KB Created: 2020-08-09 00:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53a950f17382c083f5505b6f21816acf SHA-1: 6a57e8bca5de2623006792c9fa8b207b8f22a1ae SHA-256: 807330fc27d5b55bf8bc16ad2584c9913135d798008866b075760473d33e27af
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=subject+verb+agreement+worksheet+grade+8+pdf, which is likely used to obscure the final destination. The ML classifier strongly indicates maliciousness, and the PDF structure suggests a link farm designed for SEO manipulation to distribute malicious content.

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://ttraff.ru/pify?keyword=subject+verb+agreement+worksheet+grade+8+pdf In PDF document text
    • http://tonalega.esroof.com/uploads/1/3/1/4/131408027/wewobuguti-woxaguwirefut-wesaxep-vifuv.pdfIn PDF document text
    • http://files.columbialibertarians.com/uploads/1/3/0/8/130814605/f9fd9f19bd9809.pdfIn PDF document text
    • http://files.zaxanagian.com/uploads/1/3/1/6/131606065/7958746.pdfIn PDF document text
    • http://files.westcovinajudodojo.org/uploads/1/3/0/7/130740429/3921324.pdfIn PDF document text
    • http://files.pinebowerbc.org/uploads/1/3/0/7/130775588/8046707.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/1/0429/1353/0019/files/17693277373.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/93705486798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/zisogoxofos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7689/3334/files/94001183679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1250/5252/files/debuwazimumuvuwubefubap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5122/7048/files/13676636399.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46905239833.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7796/7778/files/dekejariku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/xadovoretepifo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/fudonoruwevijinaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8888/5413/files/96284811860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8921/6167/files/zujituzigududafojesaxasaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/30914379349.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5012/3932/files/energy_storage_systems.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_off0000837a.bin
7c6f5aadfa21d8fcf04fa4a08121c894a4356cf0d20c6f164fb232b0979d1396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x837A 6268 bytes
font_01_sfnt_off000098bd.bin
19355599d08893ce0d519ff1c18c7e47a25f7a224d0ca902650886a5af9d3575		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98BD 10296 bytes

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