Malicious PDF — malware analysis report

Static analysis result for SHA-256 80191aacb0f09238…

MALICIOUS

PDF

42.1 KB Created: 2020-08-15 05:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29c77a49795514ed8e92124cb0ed8449 SHA-1: 78dcce47ea90d562847b00144f95ac66d8bdf903 SHA-256: 80191aacb0f092387d8ad1b08123835628fb1d42ecdb216f2fabe6e8c054ed63
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a link farm of 30 other PDF files, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. The embedded URL and the PDF link farm heuristic suggest a spearphishing attachment attack pattern.

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=m%25C3%25A9decin+anesth%25C3%25A9siste-+r%25C3%25A9animateur+formation In PDF document text
    • http://files.robertschrackdesigns.com/uploads/1/3/1/6/131636954/gisod_fizerezupu_kiruwisosaxis_xopafatokeketep.pdfIn PDF document text
    • http://files.mafhaus.com/uploads/1/3/1/4/131453998/wuzepe.pdfIn PDF document text
    • http://files.triumphantchicks.com/uploads/1/3/1/3/131380029/neforolomopi_nojiv_pefabixufometi_sanumiwukirab.pdfIn PDF document text
    • http://files.thetastingspoon.org/uploads/1/3/1/3/131379718/fivipoxoveven.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/1/0435/0056/8736/files/31274687544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/66579306233.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3486/1987/files/81569445912.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/laluwipojexifepusazi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7135/4533/files/security_risk_assessment_handbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7325/7118/files/convert_xps_to_word.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7357/5841/files/parakipolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2478/4283/files/26006165977.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/66244985323.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/5515259897.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/falof.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_off000062ae.bin
32a296bd94512d08d70ad3ef55bf7be6d32340df6635e97297d26896c02aa7a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AE 5408 bytes
font_01_sfnt_off000074a8.bin
bf52e15e5a9ae3134456f19c5bc3fa4490200a49187431ca5b4e107a1a74d727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A8 11612 bytes

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