Malicious PDF — malware analysis report

Static analysis result for SHA-256 828b3daf94881eb5…

MALICIOUS

PDF

40.4 KB Created: 2020-07-20 06:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd2ccd5f8c98d9f24fb6430405d9b6c8 SHA-1: 3add46675edc55ef2181909324674bac0cbbd773 SHA-256: 828b3daf94881eb53686624ff1245cc06bf3614b846a6ee371e20f258ca64b0d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded URLs, many of which point to domains associated with link farms and redirectors. One critical heuristic firing indicates links to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The document body appears to be largely corrupted or obfuscated, but the presence of numerous links suggests a malicious intent to direct users to harmful websites.

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.
  • 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.
  • 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/wb?keyword=bring%20it%20on%20home%20to%20me%20sheet%20music%20pdf
    • http://files.stjohnsuccfogelsville.com/uploads/1/3/1/6/131637385/3395888e2228.pdf
    • http://files.cacmun41.org/uploads/1/3/1/4/131453536/figubozipamot.pdf
    • http://files.handyvillage.com/uploads/1/3/1/4/131483662/39067632e9f7.pdf
    • http://files.southerntackleworksfl.com/uploads/1/3/1/4/131437491/jipet.pdf
    • http://files.estruckmuller.eu/uploads/1/3/1/8/131872054/39f078b34805cd.pdf
    • http://files.geographypods.com/uploads/1/3/1/4/131453241/bepimumewemoxetex.pdf
    • http://files.maypalacevail.net/uploads/1/3/1/3/131398251/zaludok.pdf
    • http://files.southerntackleworksfl.com/uploads
    • https://lakuvipejuz106751964.files.wordpress.com/2020/07/wagawigolarafesupum.pdf
    • https://zimekenasof.files.wordpress.com/2020/07/74951816693.pdf
    • https://jiledudosiso.files.wordpress.com/2020/06/nevutokuna.pdf
    • https://daritawaba.files.wordpress.com/2020/07/31985394358.pdf
    • https://xebodizaz.files.wordpress.com/2020/07/25913399065.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/9337731806.pdf
    • https://cdn.shopify.com/s/files/1/0430/5082/7929/files/novimagijufanul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75877947267.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4823/files/84133024411.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/rexenokewazejadado.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/xigidedukafoxodigepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/remudobuvag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005edf.bin
6bf314f19258bd9dea06125379c0db3f618a6f46759c8df4af160e7ee8644f3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDF 5260 bytes
font_01_sfnt_off00007097.bin
72eecb5d3a7b1e91856e614f1c6db4c29742770ccf358289c4004e19258417f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7097 10264 bytes