Malicious PDF — malware analysis report

Static analysis result for SHA-256 305555a7da4ad651…

MALICIOUS

PDF

40.7 KB Created: 2020-08-31 23:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55a1e577322452e584b63af831204c23 SHA-1: ea2bc9c98ec317a76a238d9310396d624a3a9d9f SHA-256: 305555a7da4ad651cda97f426b17d94be3b735d727d8cc1918c619a13851005d
120 Risk Score

Malware Insights

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

The PDF file contains a prominent link to 'ttraff.ru' which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Opera browser old version apk free', suggesting a lure to download potentially unwanted or malicious software. The presence of a large number of embedded links, many pointing to 'static.usrfiles.com', indicates a link farm designed to improve search engine ranking for the lure, further supporting the malicious intent.

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=opera+browser+old+version+apk+free
    • http://www.opera.comCompany
    • https://static.usrfiles.com/ugd/b8c837_221e863d8c2e4f82b484c1aacc21ca16.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fd28b0e5a8e45b1b1abb0d3e9fafe23.pdf
    • https://static.usrfiles.com/ugd/217d68_08aecf73a680434b8623e811ce5f43ce.pdf
    • https://static.usrfiles.com/ugd/1b8612_085016e8e8b749e89c4767e040b151c1.pdf
    • https://static.usrfiles.com/ugd/0789d5_ddee59f7f7ca460b9b6a204e8bb3aea8.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/9903328833.pdf
    • https://cdn.shopify.com/s/files/1/0434/4446/9927/files/finejufelasoxog.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0826/files/psp_iso_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/1873/0147/files/nepagenimazumizuzesudus.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/17621560797.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/xedijatatekim.pdf
    • https://static.usrfiles.com/ugd/02beb7_4a6a6c109ccb4c71823f1e2b53d8353b.pdf
    • https://static.usrfiles.com/ugd/7198c1_25b0c6b88342450e9d558a30f8549e1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbad77c40c464302a7f3396c96280163.pdf
    • https://static.usrfiles.com/ugd/8d57bd_c3822540b70e4bd38186fa053f3ddfa6.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_off000056d1.bin
8128398c796772c5f57c9d9e9c761bcbf3f74d26937ab1da2531b80930b66741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56D1 5416 bytes
font_01_sfnt_off0000695a.bin
ecbb3df6961336839b6e99b228d4eeaff66ca55952bcd31606404f6f6ff027de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695A 14528 bytes

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