Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c136f76c416354…

MALICIOUS

PDF

47.5 KB Created: 2020-08-21 17:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be71b05f55a0541248999539a56d8d8e SHA-1: 63a598571053acae2402c9b25e968d7d81fd1423 SHA-256: d8c136f76c41635404d5b4f1dd2d22fc6714e67fab834fb90b27da4e1b274b26
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'discounted cash flow spreadsheet real estate' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also flagged this PDF as malicious.

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/pify?keyword=discounted+cash+flow+spreadsheet+real+estate
    • http://files.johnlcbarnes.com/uploads/1/3/1/4/131437418/setosuz.pdf
    • http://xetabex.paulgoldberg.com/uploads/1/3/2/7/132740328/e948790368.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/98836687.pdf
    • https://cdn.shopify.com/s/files/1/0446/1376/3235/files/english_syntactic_structures_aarts.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/besizine.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/maxopo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1770/files/bosibezofeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/99296573959.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wixet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/80372833114.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/85508561326.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/dawovavofad.pdf
    • https://cdn.shopify.com/s/files/1/0429/7746/0383/files/nabonusodatofenakib.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8041/files/apps_for_jio_phone_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/govepasiju.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_off00007327.bin
c767f553a43122dbda00d2b8b7b08fdee7a63bb99333d69cedeb482880e13d16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7327 5336 bytes
font_01_sfnt_off00008553.bin
8e4cc71d0f5335f5af90a1f2294540ff9d46c621afe841d36b2be9049516c778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8553 13556 bytes

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