Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f73d44bb79a3a64…

MALICIOUS

PDF

62.6 KB Created: 2020-09-01 18:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6c4a4eef6370e2c1923f9a2695dfe83 SHA-1: f9dcfc4ec649686637547885017ab682756b02ac SHA-256: 3f73d44bb79a3a6407d96a175f4b640daf1aa4f825f0fbcf6e26f73209b9536b
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, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=jethro+tull+aqualung+full+album+free', is designed to lure users by appearing as a search result for popular music. The document also contains a large number of embedded links to external PDFs, indicating a link farm strategy. The ML classifier strongly supports the malicious nature of this PDF.

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=jethro+tull+aqualung+full+album+free
    • https://static.usrfiles.com/ugd/dfb5f8_5eb4595ce9114f79ba57cb949f16281d.pdf
    • https://static.usrfiles.com/ugd/eda9ba_09deefe3f7104deda7a4b14217fd6a3e.pdf
    • https://static.usrfiles.com/ugd/d17951_5dd4ab2da4ac400eb7a68c49656bfa6b.pdf
    • https://static.usrfiles.com/ugd/3bcfef_5908b136828a4a56b8caa425595f5068.pdf
    • https://static.usrfiles.com/ugd/b8c837_af9f47ef1d0647a697260afccf296c92.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/10098107968.pdf
    • https://static.usrfiles.com/ugd/735424_5f4ca92a7e8e491c869c9fcc3a098c8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b4af1d3e5da46b993c3cdf2095c5294.pdf
    • https://static.usrfiles.com/ugd/b8c837_824834d97be84c3589c608d1eae0b7e8.pdf
    • https://static.usrfiles.com/ugd/71fd01_7748daff032f4b659c43fc29b32da985.pdf
    • https://static.usrfiles.com/ugd/2f8cea_9274fabdeb88452f9720b49441902ae6.pdf
    • https://static.usrfiles.com/ugd/99965f_5d0a663b84124251ae85670b78127b8c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a235.bin
f741b55a5b9dd97c7dfacef7bdc516015818737c7a3e05b7ffe960505e5eb6f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA235 5256 bytes
font_01_sfnt_off0000b3f3.bin
92ba7d69419b7040f753b40f1341dfe0a5ceeeab63684e8526430d46ec36028c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F3 10604 bytes
font_02_sfnt_off0000d850.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 16204 bytes

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