Malicious PDF — malware analysis report

Static analysis result for SHA-256 c136c99cb770d76c…

MALICIOUS

PDF

46.4 KB Created: 2020-08-31 19:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ce17313d5e16e2ee7777f46572b4110 SHA-1: 52b82caeb01c105a74e7badab41cc30a062d9f88 SHA-256: c136c99cb770d76cbedba8ce19cfc96c4dbc3a20af41c782d287ec78a3633558
120 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous URLs. One prominent URL, 'https://ttraff.ru/wix?keyword=android+studio+install+git+plugin', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on static.usrfiles.com, suggesting a coordinated effort to lure users to potentially harmful content. No scripts were extracted from this sample.

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=android+studio+install+git+plugin
    • https://static.usrfiles.com/ugd/e23fbb_1acfd570915445dc82e27966bf6a673f.pdf
    • https://static.usrfiles.com/ugd/4b874d_9d97f3d2ac0f4287b962b90825630f16.pdf
    • https://static.usrfiles.com/ugd/b8c837_5015e02931f64b9895021ce8d35564fb.pdf
    • https://static.usrfiles.com/ugd/12f4eb_3af56b9934ab49058840413eedc8ae87.pdf
    • https://static.usrfiles.com/ugd/3aee12_a392ec85c5ac4d44b21487c961b96c11.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/xetitomupoxovufes.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/14050066725.pdf
    • https://static.usrfiles.com/ugd/5b9365_85a57742d77c4111af2e0aeb39740d76.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d8ebc9eb9a54044a206f993f0b7e1a4.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9764/files/56699639012.pdf
    • https://cdn.shopify.com/s/files/1/0428/5058/2684/files/driver_booster_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/9550/4536/files/21043308714.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_off000077a9.bin
bbfee1c34ebdb22c2592736a00590426ea42d3a490412b02e0b033ab42fcd9e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A9 5116 bytes
font_01_sfnt_off0000891e.bin
690787e1c407dde3808092a4cf3d32efeda5ef9788c3ec8cf4ee1ec023fe86a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x891E 10664 bytes

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