Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04e1b60f1e055ab…

MALICIOUS

PDF

53.8 KB Created: 2020-08-29 23:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbc3259d70cdb37dfb0beaad9001eca0 SHA-1: a752aa7e670f0fa31a8329dc02b565237f9a1793 SHA-256: b04e1b60f1e055ab95996dd96d9090ca338a8d44b44d64dedd5220f26cb49ff6
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified as a link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.com/wix?keyword=bajar+musica+gratis+de+los+tigres+del+norte', is designed to lure users under the guise of free music downloads. The document body, though heavily obfuscated, also contains this URL and other links pointing to a large number of PDFs, suggesting a SEO poisoning or link farm tactic. 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.com/wix?keyword=bajar+musica+gratis+de+los+tigres+del+norte
    • https://static.usrfiles.com/ugd/b8c837_611ab0e9ed0f4056b6505d083582c493.pdf
    • https://static.usrfiles.com/ugd/b8c837_477a9aa39b4845dcbe26f16521782329.pdf
    • https://static.usrfiles.com/ugd/b8c837_f01de4e080714364a9ac9bfc411a4b7e.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/vasulegorugare.pdf
    • https://cdn.shopify.com/s/files/1/0437/7270/6977/files/65697135277.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/general_virology_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/lejuvokimigepidus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/58936661512.pdf
    • https://cdn.shopify.com/s/files/1/0434/2605/4306/files/faxofisemifelugobilupam.pdf
    • https://static.usrfiles.com/ugd/271e65_c88ef0b631604480b08fe2f8fc4de3e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_76758413ac8b4756a5640b3d42018e38.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059bb.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59BB 6440 bytes
font_01_sfnt_off000069af.bin
d0ba7d71f0a5d3b69d72ba9eecce17a238d8529dd269e6a439b4474b17d50711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AF 5268 bytes
font_02_sfnt_off00007b79.bin
b1a7950a8d458f2fe088bc715610ba1601287f7f33d31879395857573253695e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B79 11964 bytes
font_03_sfnt_off0000a2b1.bin
c556cf89f9aa0da03bf2103f8662d8ffc1b6c84104292b2792833e11fb7b756c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B1 16944 bytes
font_04_sfnt_off0000b985.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB985 4324 bytes

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