Malicious PDF — malware analysis report

Static analysis result for SHA-256 3815888739d57531…

MALICIOUS

PDF

40.6 KB Created: 2020-08-14 17:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0dfaa8c02c5642b0501c4f0d68f8e09 SHA-1: c4fcb33b04565d6df9b0fd93a891ee8587909e37 SHA-256: 3815888739d57531668eca7013762cecf0e4caab74d2da842afd88213ccfdec1
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Brooklands college weybridge application form', suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify but some on suspicious domains, further indicates a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=brooklands+college+weybridge+application+form
    • http://jewukibew.civitavecchia.ca/uploads/1/3/1/0/131069839/4116505.pdf
    • http://files.opheliawest.com/uploads/1/3/0/7/130776485/6e0db406032322.pdf
    • http://files.highperformancecoachkelly.com/uploads/1/3/1/0/131071063/gakib.pdf
    • http://kunexetij.carmodyhills.org/uploads/1/3/0/7/130775085/118cca57.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/50339840278.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/97323471111.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7473/files/allergene_stoffe_liste.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7014/files/94744327994.pdf
    • https://cdn.shopify.com/s/files/1/0434/8090/7938/files/adda_247_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/filmfare_awards_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/1587/2423/files/97007695345.pdf
    • https://cdn.shopify.com/s/files/1/0435/1141/4939/files/82156958813.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/35171593562.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_off00005e0d.bin
27c3a3950ffecf8927ec4de21641294bf53809fc039bee395cd2475d12081ff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0D 5924 bytes
font_01_sfnt_off00007230.bin
f90ea07a3c2b6f32823d52f4cfd321270fd1121acdb962c89d25c82dea54ad63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7230 10436 bytes

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