Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab26b5448d882ee…

MALICIOUS

PDF

60.5 KB Created: 2020-08-30 22:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51a02b6189b25e3a123e7e79593866dc SHA-1: ab0e7ec7a605a09aad6daca98156cb386abe6bb8 SHA-256: fab26b5448d882ee3f3387a503b03e4673fd04d1cb04d4a5424815dd5eab369e
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, with numerous embedded URLs pointing to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=unidades+del+calor+especifico'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of many links to 'static.usrfiles.com' further supports the link farm hypothesis, likely intended to obscure the final malicious destination.

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=unidades+del+calor+especifico
    • https://static.u
    • https://static.usrfiles.com/ugd/b8c837_0efc339b98e747a992879437c9e52293.pdf
    • https://static.usrfiles.com/ugd/4c1554_298bc3411ca24b1693efe44a422a8d9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_236f357a6a844886b6b9d1d0f9d061e1.pdf
    • https://static.usrfiles.com/ugd/f103bb_96e4cb99aedd47acbee6d168f2cce217.pdf
    • https://static.usrfiles.com/ugd/b8c837_07761a20b169468d989b6dfce4f0a24c.pdf
    • https://static.usrfiles.com/ugd/d775a9_a68fea140ba74712800afcd886d0df3d.pdf
    • https://static.usrfiles.com/ugd/afe78f_dc8fe6d097d74ea8ba8fb3a4ef4d4bb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dec5066c5b74e60b54c8eea77a3ec30.pdf
    • https://static.usrfiles.com/ugd/29c71c_862a6d17e41f41b0b699d4f007c65d32.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd7b5b6be6d844899ad8abd74fba38b4.pdf
    • https://static.usrfiles.com/ugd/38bf1f_32549ac52116459798f797e7ef17639e.pdf
    • https://static.usrfiles.com/ugd/7f16bd_0cd34f9dc43a4b14a8c3b6587a290237.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_off0000a156.bin
006d45398c6e8e1a739ce33aa24dd0ef4eb6332aeddc6ba86fafe0c024460bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA156 5140 bytes
font_01_sfnt_off0000b2dc.bin
edad1234edbeaf002a4d75cb4b1b8986f2beedc9d8d9ddee21c4947b531b252a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DC 16800 bytes

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