Malicious PDF — malware analysis report

Static analysis result for SHA-256 9adaf133f5527f38…

MALICIOUS

PDF

39.2 KB Created: 2020-07-30 14:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cfabfe043ba7ae7598904c0abdf0b43 SHA-1: 82d457f8526eaed6ce2bc75a018f37103e382f88 SHA-256: 9adaf133f5527f381b1a7b6376e47866ea86c9e189711286bc9d51065df3e462
150 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. Another critical heuristic identified a PDF link farm, suggesting a coordinated effort to distribute malicious links. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata related to PDF generation, but the primary malicious activity appears to be the redirection to external, potentially harmful, URLs.

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/pify?keyword=auditoria+ambiental+de+una+empresa+peruana+pdf
    • http://files.fllworkshop.org/uploads/1/3/1/4/131453215/2e0fd4dd85c259f.pdf
    • http://files.normansglutenfree.com.au/uploads/1/3/0/7/130740298/dc394bdd.pdf
    • http://files.profbulalang.com/uploads/1/3/0/8/130814411/simamesila.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/tozevetukigemiduv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6757/files/liwibanatajafelu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depuwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/27520562479.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/60712734795.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/nobiloke.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/31280069764.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/luvuginakufivoxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6039/files/jovizejidetid.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/61191022204.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.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/
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a9a.bin
642ea69e29a083681e4aad4c6360ef4d880f3d28fa4139471a860c12adb0aa34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9A 5200 bytes
font_01_sfnt_off00006c1c.bin
2c976e61b761abb8bcd70857ba2ed6fb16cf40cb42b4e05db524c631e340a317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1C 10348 bytes

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