Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e87755dd93c90a1…

MALICIOUS

PDF

35.4 KB Created: 2020-08-31 15:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9554ccfb740b702c1ad9d5568dd05375 SHA-1: 14a29b85352d2a5df839a6c18b8628ffceb3f414 SHA-256: 7e87755dd93c90a1bae71f62b8dc2f62d4a406e47f87bae4db25e909d0785e1a
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=color+green+worksheets+for+preschool'. This URL is likely used to redirect users to a malicious site. The document body, though partially corrupted, also contains this URL and references 'Color green worksheets for preschool', suggesting a lure to disguise the malicious intent. The file also exhibits characteristics of a PDF link farm, with numerous 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.ru/wix?keyword=color+green+worksheets+for+preschool
    • https://static.usrfiles.com/ugd/b7082a_d9b734d71cae4c33adaea00860953c52.pdf
    • https://static.usrfiles.com/ugd/e4ff69_2b0b509f4d54482abeb8a828bda1c35f.pdf
    • https://static.usrfiles.com/ugd/30e015_f98dad2351b54335b041ee3f74b910f9.pdf
    • https://static.usrfiles.com/ugd/4f270c_0427d154234c4a1c98f0a516436d57ef.pdf
    • https://static.usrfiles.com/ugd/913720_3930ccd18ab346a396e8c857c0a7c06d.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/ad_hoc_network_textbook.pdf
    • https://static.usrfiles.com/ugd/4ae4db_e450e9b4fb0646378d17a91c3dcce65d.pdf
    • https://static.usrfiles.com/ugd/b8c837_190d8abef2c64a88b1d03a9bea354686.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/56112104553.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/juwelabu.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_off00004c8f.bin
9a1c6c6cad8bed11977be297f67a40409956c9bd22fc9a27fa1553eb699ae322		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8F 5128 bytes
font_01_sfnt_off00005e18.bin
c50f37c344d379c2939060f459e88367a143a1f0cd27e610c0692f97a78b4ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E18 10308 bytes

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