Malicious PDF — malware analysis report

Static analysis result for SHA-256 38846219d8a39a36…

MALICIOUS

PDF

52.9 KB Created: 2020-08-31 01:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9edb5fd91c604e167a57c3b58b2806a SHA-1: 82401b6ebe8e99ab214224ee16e2e4e5327e2547 SHA-256: 38846219d8a39a367a5174078807e6f7e91e35f3603b28eb5323c99fc982f7dc
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=five+star+church+free+download'. This URL is presented within the document body, suggesting a social engineering lure to entice users to click. The presence of numerous other PDF links, many pointing to 'static.usrfiles.com', indicates a link farm strategy, likely to improve search engine ranking for malicious content or to obscure the final destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=five+star+church+free+download
    • https://static.usrfiles.com/ugd/b8c837_b1254cf299d44f93af00556eb2829e6a.pdf
    • https://static.usrfiles.com/ugd/1a89c8_de8bc8547465468eba10f978f5c3babd.pdf
    • https://static.usrfiles.com/ugd/d17951_8497cf03eb204a9f93a1eef9f55f3595.pdf
    • https://static.usrfiles.com/ugd/b972d5_6ac7881ec2cf4a9d908ee82916c034dc.pdf
    • https://cdn.shopify.com/s/files/1/0441/0589/1992/files/and_so_this_is_christmas_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/jonizawusipovadenalin.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/makalah_agama_islam_tentang_zakat.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/mevivubadedowaniwem.pdf
    • https://static.usrfiles.com/ugd/7ff653_80ea4b97d02d4c73924075e906275bfb.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a487ad2d96e4df2949d3a1a9a78f803.pdf
    • https://static.usrfiles.com/ugd/b8c837_70961a14e05f4d12a2d9443d7faf2da3.pdf
    • https://static.usrfiles.com/ugd/ec0c41_b5a751631240455fb0da0ed0366d0762.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_0ca6bff9cba84787afcb24bac167f032.pdf
    • https://static.usrfiles.com/ugd/33ab24_f584874cde434cb090e7ef7c04901ea7.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_off00008f12.bin
a89e6a1fe47aa19fde28d7e21fa7029e0d466b273bfb33f36c03f6351b446a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F12 5216 bytes
font_01_sfnt_off0000a0e0.bin
95d81bf5677e8cd20ae1b0b43ebf3e450ead1029ef3e65d19b0fe76e4f86efc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E0 11204 bytes

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