Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e399a87fa77a2c8…

MALICIOUS

PDF

44.9 KB Created: 2020-09-01 07:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6a08639a6ebc4eca596ff9fe40be3b6 SHA-1: 0ef596dfd3c1b29405e160b28e667ae89fa68bf0 SHA-256: 9e399a87fa77a2c8222e240db96c31ea2362b99f03191962293094a6dfd5ceb0
150 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 PDF files hosted on Shopify. One of these links, however, redirects to a known malicious domain (ttraff.cc). This suggests a link farm or redirection attack designed to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=free++a5+brochure+template+indesign
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/38753912467.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/42617046767.pdf
    • https://cdn.shopify.com/s/files/1/0446/3860/1379/files/andrews_college_admission_2018_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/4718/9670/files/vexanojopamegab.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6352/files/gusiwebumuxavekoxuzuni.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/jozemuwimufalonesol.pdf
    • https://cdn.shopify.com/s/files/1/0434/4755/0119/files/xasonurenotodelamew.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7183/files/ipad_kindle_app_won_t_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/8063/7861/files/29678033062.pdf
    • https://static.usrfiles.com/ugd/930050_199c8df60eee4bfa9462937e8cc7ed14.pdf
    • https://static.usrfiles.com/ugd/b8c837_356dc075a8df438885c06052ce8c0c88.pdf
    • https://static.usrfiles.com/ugd/04c368_adda7656951848449df325169d8f2fd3.pdf
    • https://static.usrfiles.com/ugd/e3ff21_1617cc307f284bbcbd162b754de1130b.pdf
    • https://static.usrfiles.com/ugd/b8c837_eaec37f21ff64c6ca47c91c912292bbe.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_off000070c4.bin
025642fea8275ce987f51faf90d953da8300e12466a99ea5128b89818e27021b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C4 5708 bytes
font_01_sfnt_off000083fe.bin
e3ee029ca2b8cfd9116605811c7732286f31467f52b9bc6885f8c8eebd55b357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FE 10240 bytes

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