Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1fcb0d80f2bdd7…

MALICIOUS

PDF

43.4 KB Created: 2020-08-01 07:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dd71fb014d7c607a4711015e1c12437 SHA-1: 65340833d6b830ab41d2c9145b2321475ade6e30 SHA-256: 3e1fcb0d80f2bdd797b24e1587c70613899dbffc82c257453d32ff836081f994
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a link farm strategy, and 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms redirection to malicious infrastructure. The document body, though heavily obfuscated, contains references to 'dermagist neck cream' and the PDF generation tool 'wkhtmltopdf', suggesting a lure for commercial products to mask the malicious link farm.

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=dermagist+neck+cream
    • http://files.thefabriclibraryenniskillenltd.com/uploads/1/3/1/3/131398252/71f20.pdf
    • http://files.footballernowapp.com/uploads/1/3/1/4/131437513/vozawan.pdf
    • http://files.coffeeiniceland.com/uploads/1/3/1/4/131406432/7714873.pdf
    • http://files.philscrap.com/uploads/1/3/2/3/132302941/jusokomakaga-tegilijoparat-mejoraragozezix.pdf
    • https://cdn.shopify.com/s/files/1/0437/5363/5989/files/toras.pdf
    • https://cdn.shopify.com/s/files/1/0433/5897/8207/files/fowurofubanigowul.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4600/files/2573435506.pdf
    • https://cdn.shopify.com/s/files/1/0430/9195/1769/files/mawitajibuxisivavize.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/webuzigasagekamefipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/7865781664.pdf
    • https://cdn.shopify.com/s/files/1/0428/6359/1590/files/kiruwelikabevomut.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/70062322157.pdf
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/lavotulixotetezijedatokif.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/ninulawosijodevafu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e39.bin
e86b7de91a680ec709bf5d23c07e3eb2d9df58f8ef1f0fcd132b9a84bbd01de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E39 4828 bytes
font_01_sfnt_off00006e8b.bin
f65f3fa7402881ee229d20aaad025716a9afa24e59f95c4abdfa9575e53506c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8B 10688 bytes
font_02_sfnt_off0000930b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x930B 4324 bytes

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