Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4d8ef59bc969f9…

MALICIOUS

PDF

37.9 KB Created: 2020-08-30 02:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4c4fe338bad2e4364bce7b389f59e4d SHA-1: c90705ed99649968f14f23e2eec1845ebb007eca SHA-256: ba4d8ef59bc969f971cf935952718f32426a3fb79745f652c1a3018ce02178c7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1204.002 Malicious Link

The PDF file contains a critical heuristic indicating it links to a known malicious redirector. Additionally, it exhibits a 'link farm' pattern, embedding numerous external PDF links. A high-severity heuristic also flags a 'clipboard command lure,' instructing the user to copy and paste content into a shell, which is a common social engineering tactic to trick users into executing commands. The primary malicious URL identified is https://ttraff.ru/wix?keyword=piriform+recuva+manual.

Heuristics 4

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=piriform+recuva+manual
    • https://static.usrfiles.com/ugd/9dda13_84d1525d1af94f49bcc6e7f29f3f776e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d839e889e1743e389a3da0ab895b5a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_8851dfdb54e04661ba2ea098443a24b2.pdf
    • https://cdn.shopify.com/s/files/1/0432/8803/5486/files/jiposigenugawiru.pdf
    • https://cdn.shopify.com/s/files/1/0437/0215/7466/files/28035020767.pdf
    • https://cdn.shopify.com/s/files/1/0430/5960/9753/files/binary_trees_in_data_structure.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9452/files/vikujujidop.pdf
    • https://cdn.shopify.com/s/files/1/0436/0152/6948/files/biodata_format_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/dibawelede.pdf
    • https://static.usrfiles.com/ugd/89064d_5ce357a535ab4e82aa4c4b0c9d8d8b6a.pdf
    • https://static.usrfiles.com/ugd/7c3584_40656c5669ab43dfbe5a03288057f7e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9d62826f4c943ec927b97478bc63ef4.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fd3992597ae4fa381a04e2fe2ee66d6.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_off000058a8.bin
fd700e74952e23c8c27af0219e0aaef85fb43a8da9e5811af59f469ac6b8993a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A8 4908 bytes
font_01_sfnt_off00006946.bin
bb74143ad04f55dcfa2bdcfc780a23b855eab2cbacc583f9631f68ea17734ec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6946 10000 bytes

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