Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8041c4c2bb48fd…

MALICIOUS

PDF

41.5 KB Created: 2020-08-31 01:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 593959b81a88c8de5e4b23500955d264 SHA-1: 6c8d1ed53249cef6b275f711cefae3c32797527a SHA-256: ce8041c4c2bb48fd1af5f4c1d1ce7c0e8926cd6d9f4c8436dd749d679bae227c
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDF files, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and a benign-looking PDF filename, suggesting a lure to disguise the malicious intent. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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/wix?keyword=reading+comprehension+worksheets+multiple+choice+questions
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/wokuxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4822/files/64733477703.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/zuvazetevazomega.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/51692000530.pdf
    • https://cdn.shopify.com/s/files/1/0430/3978/5111/files/simizej.pdf
    • https://static.usrfiles.com/ugd/45e30f_7016f0b3ed7348a1bea3af55c5be68d2.pdf
    • https://static.usrfiles.com/ugd/d902bb_7354fb4e557446bbbbf98d6112c3df01.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfd30181caeb4833b699857a028f5062.pdf
    • https://static.usrfiles.com/ugd/b914b5_e2834dbc6851417987563540f6de9038.pdf
    • https://static.usrfiles.com/ugd/ab922d_bc68aab815154b2b935e63455d370365.pdf
    • https://static.usrfiles.com/ugd/b8c837_d143e347cb6f40d6897c1cffc41a7f4a.pdf
    • https://static.usrfiles.com/ugd/f459ea_a68b39d055d24291a3c694b65973404d.pdf
    • https://static.usrfiles.com/ugd/dd4472_187147a12f2148a7a14c5a0e7443b8c1.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_off000061ca.bin
6f4fa950d8ecbad80301a4a5787129fbf465261d7b4aac17bb1c176e068e74fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CA 5776 bytes
font_01_sfnt_off00007555.bin
777352a8305bfe6c939d6bd4ae1331bcd3e812add1c58ff981c184bea5386294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7555 10368 bytes

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