Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c3a49564a67a3c…

MALICIOUS

PDF

38.6 KB Created: 2020-08-16 11:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 812c1232d8549349dc8228907630899e SHA-1: 3d0d095eae1c1529705704dc1459e1f49db9d543 SHA-256: b5c3a49564a67a3c1a67b86a3d64934aee6dc63c05c77f6163b829a6b9bedc31
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.cc/pify?keyword=introducing+yourself+in+english+worksheet+pdf'. The document body, though heavily obfuscated, contains text suggesting it is an English worksheet, which is likely a lure. The presence of numerous Shopify links, while mostly benign, contributes to the SEO link farm heuristic. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing site or malware download.

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.cc/pify?keyword=introducing+yourself+in+english+worksheet+pdf
    • http://files.owenyelland.com/uploads/1/3/0/9/130969477/7f1721664c13.pdf
    • https://cdn.shopify.com/s/files/1/0438/1927/0306/files/62682405513.pdf
    • https://cdn.shopify.com/s/files/1/0430/9942/2881/files/2188579003.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/zawuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/8600/4899/files/46218381644.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdf
    • https://cdn.shopify.com/s/files/1/0435/7835/9967/files/12493832246.pdf
    • https://cdn.shopify.com/s/files/1/0434/2756/1634/files/27167475356.pdf
    • https://cdn.shopify.com/s/files/1/0435/1151/3252/files/le_branhamisme.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_off000058c7.bin
c474c7ce6cc53de90b0324453a2cdefb3f9f8283ead2e606eeda8d2331ad72bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C7 5404 bytes
font_01_sfnt_off00006b3e.bin
060506e0609cccbd4b2fc05fde845d1d5d8b61e63bee5eb43325d9feb9c0aaf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3E 10084 bytes

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