Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76cf75bf2d43944…

MALICIOUS

PDF

38.7 KB Created: 2020-09-05 18:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae8074c64e4da1870a3eb594bb592d5d SHA-1: c5db64c81462508f00b941c62b04232d1acfb7b8 SHA-256: e76cf75bf2d43944b17f54d3ff9b5666951a64f182ba7d7fe0508c8c5b3916b2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=brown+eyed+girl+sheet+music+guitar+free'. This URL is embedded within the document body, which also contains text related to sheet music, suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.me/wix?keyword=brown+eyed+girl+sheet+music+guitar+free
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/23998795026.pdf
    • https://cdn.shopify.com/s/files/1/0435/5502/9141/files/chicen_invaders_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/carlos_castaneda_relatos_de_poder.pdf
    • https://static.usrfiles.com/ugd/868b90_0d0af07ae10a4e42ba1bc87b2676633b.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/15483619252.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1125/files/automate_the_boring_stuff_with_python_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/medupanefefemotodofigej.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/76161190198.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_off00004cd8.bin
9c47c2d651c859641520a5d3e25e6f9a3fab22ecb59a75450928ff89c77f2b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD8 5680 bytes
font_01_sfnt_off0000601f.bin
62357ca2da8be63ddccefa7d80dd789b571146752c3e68adddba3f8390101b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601F 14768 bytes

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