Malicious PDF — malware analysis report

Static analysis result for SHA-256 450e1b0a33ff247b…

MALICIOUS

PDF

79.3 KB Created: 2020-08-29 11:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b123040f2c84a8878a91d403291371f1 SHA-1: e488689dc11a11c194c1ee3a9001a0680ea5218c SHA-256: 450e1b0a33ff247be17bfc3aadd3a4da22d1a46619298a95d01126606b2f87b7
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, pointing to 'https://ttraff.cc/wix?keyword=distribucion+de+poisson+ejercicios+resueltos'. This URL is presented within the document body, disguised as a link related to 'distribucion de poisson ejercicios resueltos'. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content. The ML classifier strongly flagged this PDF as malicious.

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.cc/wix?keyword=distribucion+de+poisson+ejercicios+resueltos
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/91216703829.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/strategic_thinking_in_business.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2034/files/omron_hem-_711.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/86410198734.pdf
    • https://static.usrfiles.com/ugd/b8c837_6116d70b1f40463ba3c080b58084a790.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexanenivoxepabulolud.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/princeton_apush_review_book_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9750/files/wazarejisavaxoxerosu.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e04610e10ff46a4b195ffd7d0581162.pdf
    • https://static.usrfiles.com/ugd/b8c837_acd4e2360e3442e3b86e781b90b26e2c.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cacc.bin
6b2c7c244faa2db7230b27e40e9a0b3e415dedf1c8209e150cb7932facd7abd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 4952 bytes
font_01_sfnt_off0000dba2.bin
ae1917b62dac7199a13dac8b10f759575a35dea2e4a6aeb014e4575ff317071a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 15148 bytes
font_02_sfnt_off00010ac0.bin
d9a7d65d2cae3d663f5ff0176506b9db81efc4a2502dcc2a634a7c2cb165c14c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 16092 bytes
font_03_sfnt_off00011f82.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 4324 bytes

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