Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a9696b84651bd6…

MALICIOUS

PDF

42.6 KB Created: 2020-08-31 01:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fecff4fc4fce8f5e5fe6711d19b0fde SHA-1: 2f45ed0843c0c4124060bc397aa9f4ead52c9057 SHA-256: 90a9696b84651bd604cc31bb40e542800830e053104695deda8ccd293652d91c
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which resolve to 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same malicious URL. The primary intent appears to be directing users to malicious infrastructure via the embedded link.

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/wix?keyword=pastorela+corta+para+ni%25C3%25B1os+primaria
    • https://static.usrfiles.com/ugd/353d00_00c97f630f524365bde515add8ee034a.pdf
    • https://static.usrfiles.com/ugd/934fc3_9deaf9c4306b44fea0fc71ba36a0d9dc.pdf
    • https://static.usrfiles.com/ugd/cac9e4_c12027ca14de4dd19f5c3161d9119bb5.pdf
    • https://static.usrfiles.com/ugd/55f640_50625ac1e9374a5da38ffba72f61be22.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b0978d96f8c45b39f765347f84a02ea.pdf
    • https://static.usrfiles.com/ugd/cac9e4_63931d5935834ebf9d43cad7efaeccb4.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4016/files/napivibebi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7329/6789/files/21263864946.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/dudima.pdf
    • https://cdn.shopify.com/s/files/1/0428/9724/4316/files/gosutagisugipomub.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1543/files/engineering_graphics_8th_edition.pdf
    • https://static.usrfiles.com/ugd/b8c837_02dd6ffa13a441a082f6696bee891411.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_cec8bca50e1a4b13bdcaa1aa060dd062.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdf5f146ca094003854c4e8304bba7de.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c78fa3d490242d9ad021d81dccf3c52.pdf
    • https://static.usrfiles.com/ugd/b8c837_a10c846233ad4b3b9f0471288f57050a.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_off00006380.bin
dc8839ef618945f108b0e3ee509379afb73cc66245f849a1665e67100a4b4c88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6380 5292 bytes
font_01_sfnt_off00007523.bin
edc31908dd5be8b2c0f79eeb4796cc957b8c8e0f30baeebe1f4177ad9e664349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7523 12240 bytes

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