Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4815b85629fd19…

MALICIOUS

PDF

48.4 KB Created: 2020-07-31 00:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83be736aa9a2eedd9a25ba7223e44a42 SHA-1: b9f3fe51fda4ff24a3dcfabddf4616c139bb0a63 SHA-256: bf4815b85629fd19f6a6d2c60c66ed0fa271d8335663523b6eaec2850e012d52
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to IELTS vocabulary, likely to trick users into clicking the malicious link. The presence of multiple external PDF links further supports a link farm or redirection strategy.

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=ielts+writing+task+1+bar+chart+vocabulary+pdf
    • http://files.australianchurchofantioch.com/uploads/1/3/1/4/131437249/jajobaxar_xozunagerumog.pdf
    • http://files.ppsia.org/uploads/1/3/1/1/131164168/3141454.pdf
    • http://files.risingravenband.com/uploads/1/3/1/3/131384018/buvab.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5026/files/vubagal.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/retuxodukol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99237037604.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/geviguz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/82453199225.pdf
    • https://cdn.shopify.com/s/files/1/0432/0352/6820/files/finelawidukabenep.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/63248150075.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/96140145960.pdf
    • https://cdn.shopify.com/s/files/1/0433/6353/2951/files/16422602670.pdf
    • https://cdn.shopify.com/s/files/1/0434/1491/3191/files/65964887682.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0096/files/16680254643.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/97917800878.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_off00007bea.bin
86bdc0200d1cc46e042bbae6c7b4a55fc04cad3833fd541d3d6e0ed8ddba1592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEA 5744 bytes
font_01_sfnt_off00008f84.bin
ea2c61034b98e75eeca681658de0f296bf1e2968014b17f8682d577b4309c7d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F84 10828 bytes

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