Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd2ac58fb78b15f…

MALICIOUS

PDF

41.1 KB Created: 2020-08-29 02:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ee59b55434a7341ac9f57587b9828be SHA-1: e9e46a96a65a3712b36e9ec8539d3f22d11cd265 SHA-256: ebd2ac58fb78b15fb61eadc14f610cfc8cab05f8263f5b1eaff5016d29fcaae6
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a link farm, a common tactic for SEO poisoning and distributing malicious content. One of the embedded URLs, 'https://ttraff.link/wix?keyword=calcul+expression+num%25C3%25A9rique+5%25C3%25A8me', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify, suggesting an attempt to lure users to malicious sites.

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.link/wix?keyword=calcul+expression+num%25C3%25A9rique+5%25C3%25A8me
    • https://cdn.shopify.com/s/files/1/0461/9721/1294/files/oxford_english_for_careers_engineeri.pdf
    • https://cdn.shopify.com/s/files/1/0439/7219/8558/files/84400510094.pdf
    • https://cdn.shopify.com/s/files/1/0439/0731/7912/files/advanced_trauma_life_support_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21884581804.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/zoniwumasozotixewikobu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/71304305718.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4343/files/25242763506.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7f2821b128948499859d5dc8850d0dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f4690af8743433699ead449f78db290.pdf
    • https://static.usrfiles.com/ugd/b8c837_97e2640bd1cb497eaffce27b09671eb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b67014d539ea4db3bcd7b30ca35ce6ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_b100a3be4a034c869ea71974aaa80930.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca84c32b404848afb21662144e46e05e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8a50608357542c586ca6fb062044874.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_off00005f0e.bin
66a2a8600b3ff2cd960ff02d7cfebcd972f0811f436020f08d3c392c1f103945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0E 5584 bytes
font_01_sfnt_off00007162.bin
a4911c5546e360206209bf149627102484e5c70ede3f7ac89dc02a4b03ba35cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7162 11320 bytes

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