Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8eb8d3be97eb80c…

MALICIOUS

PDF

34.7 KB Created: 2020-08-30 13:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c01447e3e6a32c1f84db0e66857da7c2 SHA-1: 691854cb2481e6ad14750046a23a907626f3f821 SHA-256: c8eb8d3be97eb80c2795155c6d96146c10d6196f38bdfd7296db6a5aa9581906
150 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for phishing or malware delivery. The document body, though heavily obfuscated, contains text related to an academic exam and the redirector URL itself, suggesting a lure. The presence of a PDF link farm further indicates malicious intent to distribute content or redirect users. 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.club/wix?keyword=examen+de+tercer+bimestre+de+sexto+grado
    • https://cdn.shopify.com/s/files/1/0428/9540/9311/files/75866694646.pdf
    • https://cdn.shopify.com/s/files/1/0439/7491/8302/files/8687317583.pdf
    • https://cdn.shopify.com/s/files/1/0437/6176/2455/files/30946578030.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/gauge_theories_in_particle_physics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekefokatonerosabiwifeva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/dudewesefibetu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1295/files/wimofajetaresolewowepin.pdf
    • https://static.usrfiles.com/ugd/f46427_930f1286936946d7941bbe519c7749f6.pdf
    • https://static.usrfiles.com/ugd/c63dba_50d2ff7c378e4a639f0d5a5d413d9b2f.pdf
    • https://static.usrfiles.com/ugd/e643da_4cf88acfbac84a6c86cd4b5abbfb24a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb5060f414fa44a087299213ea30f6b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_6694744333924d179f20ebd4164a7612.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_off00004926.bin
bdc06145be79102ae85a34f39b5cd8f93a4aa4df459e7d6563b0878153ce81c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4926 5392 bytes
font_01_sfnt_off00005b5f.bin
de9a811e31dae65570606f2cea1db17c975148c536d5dc1483c03980eaf926e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5F 10596 bytes

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