Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e491d21cbab2761…

MALICIOUS

PDF

45.8 KB Created: 2020-07-19 06:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0f54ef2cd65a1715e56f98159a0fc42 SHA-1: 02cf9ab5656d9692c6599f978b9aea1fd4c8e627 SHA-256: 9e491d21cbab27614229887d1f0d7f889c4755cf8a072a16c7af1cbeed45c162
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic indicates these links are part of a malicious redirector infrastructure, and another flags it as a PDF SEO link farm. The ML classifier strongly supports the malicious nature of this document. The primary attack pattern involves directing users to potentially malicious or phishing websites through these numerous links.

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.com/wb?keyword=day%20by%20day%20armageddon%20pdf
    • http://files.vw-worldtraveladventures.com/uploads/1/3/0/7/130740118/razoleza.pdf
    • http://files.kidznart.com/uploads/1/3/1/0/131069961/3001637.pdf
    • http://files.chiclysoignebonviveur.com/uploads/1/3/0/7/130740056/3644215.pdf
    • http://files.bringalessiahome.com/uploads/1/3/1/0/131071063/telibodivopewalaro.pdf
    • http://files.joannatoole.com/uploads/1/3/1/6/131606155/vevisotugut.pdf
    • http://files.lunanguyen.com/uploads/1/3/2/6/132695457/53373028d7.pdf
    • http://files.richardsunderlandart.com/uploads/1/3/1/3/131398385/7334932.pdf
    • http://files.brightstarastro.com/uploads/1/3/0/7/130739626/6572788.pdf
    • https://xutosazibovi.files.wordpress.com/2020/07/91882612681.pdf
    • https://viwonox.files.wordpress.com/2020/07/75408231665.pdf
    • https://pomufoj.files.wordpress.com/2020/06/55303089701.pdf
    • https://tuwepuzo.files.wordpress.com/2020/06/27964563777.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/27501464312.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83971047952.pdf
    • https://cdn.shopify.com/s/files/1/0431/6607/2994/files/39475862264.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/pujawekekixixesekedapem.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/27923654738.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32506959796.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/54822777398.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_off0000756d.bin
556f55e4d01d520ed57c3815049614fa8af3c46253490d48a53d4275248d9a76
pdf-font-stream PDF embedded font (sfnt) at offset 0x756D 5052 bytes
font_01_sfnt_off0000867e.bin
01cbc41c7d5182498789d9470e150658bad87d3a1abe243e6685859ccf0a5a87
pdf-font-stream PDF embedded font (sfnt) at offset 0x867E 10432 bytes