Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c909f706d4a4276…

MALICIOUS

PDF

46.3 KB Created: 2020-08-30 09:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01db89551cf34e82fa18b81f73a93ec0 SHA-1: 5c26f1c752e6e73beaa7b410e17f55ec902512e7 SHA-256: 4c909f706d4a4276652b7e696b677e41091e84637e18e649300861c17224e4d5
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=guitarra+pdf+partituras'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs. The ML classifier also strongly flagged this PDF as malicious. These factors indicate the primary purpose is to lure users to malicious infrastructure.

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.link/wix?keyword=guitarra+pdf+partituras
    • https://static.usrfiles.com/ugd/6c032c_6fe25dc912ca4b13ae7c48625f60ddb7.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed0b716124984bd295055a03a17a085f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e49ccab4d2473b92c51524267b7cea.pdf
    • https://static.usrfiles.com/ugd/fbccce_97766ee07aa54ef08f4baaa99e08a460.pdf
    • https://static.usrfiles.com/ugd/b8c837_d607934df125460680950f31238e2375.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ffec7ef8bf841e1aef717cf53b69edb.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c8b9c234fc9424180aa2cc9a37cbb81.pdf
    • https://static.usrfiles.com/ugd/defcb2_89c00dfc78aa4e83b30542a235dfcbdf.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/elements_of_statistical_learning_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/6431/0425/files/videturolasutakuwarogowuf.pdf
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/don_the_chase_begins_again_movie.pdf
    • https://cdn.shopify.com/s/files/1/0435/1488/8360/files/alto_shaam_ctp7-_20g_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6731/files/lubuvezabiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6925/files/wigozoninirisasaja.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/java_jre_7_64_bits.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_off0000732a.bin
f24edb88d0d8112d987e1043d36cf05113a743d31cf505c778f22279be2054ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732A 5036 bytes
font_01_sfnt_off0000845d.bin
df49541855a04464bf67f6fb029d70ab75c4c11911d5755c4512912091bbe793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x845D 11888 bytes

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