Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f184c66351c99a…

MALICIOUS

PDF

45.2 KB Created: 2020-08-29 02:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1a3cf0cf3af9c8ca68481f92cadf832 SHA-1: ded9f3824528b7fb3e8d94d4ae95980ea45c6e44 SHA-256: a8f184c66351c99a3e966d66b2298d34690682b935a0ba12664642392298c397
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.ru/wix?keyword=arbol+genealogico+star+wars
    • https://cdn.shopify.com/s/files/1/0433/3705/6411/files/909347036.pdf
    • https://cdn.shopify.com/s/files/1/0434/1691/2037/files/98159668318.pdf
    • https://cdn.shopify.com/s/files/1/0428/3885/1751/files/35256545794.pdf
    • https://cdn.shopify.com/s/files/1/0435/8995/9839/files/tafukoxotesevev.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc102151c145408da4fd1d363b2187d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_778eadfd0cd3492fad1978ab6ba96529.pdf
    • https://static.usrfiles.com/ugd/b8c837_15e5dbee264b4189aa6fe418169d5cbb.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4e0950ca95c47c4bbd80cc14a98f104.pdf
    • https://static.usrfiles.com/ugd/b8c837_543d269272a24a689d5f9a5bbf8546a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c02f632acf84c31aeea09f667e395a6.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/jiruja.pdf
    • https://cdn.shopify.com/s/files/1/0438/5076/0357/files/flash_on_android.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_off00007292.bin
0e6bbe5ad004ecf816480e585d33dfed0142cb7a6d6152f17934e3103198a6dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7292 5188 bytes
font_01_sfnt_off00008452.bin
ac20c117302c1979070453c52184ebfe582066c315579d26cc62fb294d0d4fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8452 10632 bytes

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