Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6fff1516b326899…

MALICIOUS

PDF

39.1 KB Created: 2020-09-03 02:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a37d55f43f4ecaa1cf6e48dfbd9fde00 SHA-1: 9f3e776900c9bbf0f0ef55e94a311ded98fbb12a SHA-256: e6fff1516b3268994a5bb981cfbc02d1eceb7df0af442db137dba4d32e917e38
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=mariadb+workbench+performance'. This indicates an attempt to direct users to a potentially harmful site. The document body, though heavily obfuscated, also contains this URL, reinforcing its malicious intent. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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=mariadb+workbench+performance
    • https://cdn.shopify.com/s/files/1/0446/6917/3923/files/nutricion_enteral_cuidados_de_enfermeria.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/lorilulurologoretojija.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/asuran_tamil_movie_songs_masstamilan.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/2408167283.pdf
    • https://cdn.shopify.com/s/files/1/0463/8100/7003/files/dark_souls_2_save_editor.pdf
    • https://static.usrfiles.com/ugd/917232_c20bde3488c447d2806545cf5869f543.pdf
    • https://static.usrfiles.com/ugd/a44510_5f002a6eba2a49ec94390c345f3f3d5f.pdf
    • https://static.usrfiles.com/ugd/cfa91a_145d4309330444bfb2bab518c8199a8c.pdf
    • https://static.usrfiles.com/ugd/51c472_04b3a0f34e0045779476cdddfecf474c.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_off00005aa6.bin
3d4b3f416543a1b147dce8e94f0ed773ceb664cda9ab3487b845eb17f3a5697c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA6 5484 bytes
font_01_sfnt_off00006d49.bin
33ebd29d82607f6d88fd4ee39477f6ec13dcf646c195fa6597c5e38063e5fd37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D49 10304 bytes

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