Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5c1f4a2d9bb015…

MALICIOUS

PDF

32.1 KB Created: 2020-08-08 01:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 006c6d2e54c8e37f0e1fa171018eab16 SHA-1: efc1c0d75d9c22f302b95aadd716b247c482724e SHA-256: 8b5c1f4a2d9bb015df5263909091eaed98a77dde3dc5c717712448980cbd54bf
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, a technique often used to redirect users to malicious sites. One such link, 'https://ttraff.cc/pify?keyword=complex+numbers+test+pdf', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=complex+numbers+test+pdf
    • http://files.swimmontereybay.org/uploads/1/3/0/8/130874299/nuvesej_fawosi.pdf
    • http://files.aajamn.com/uploads/1/3/0/7/130740571/leseronezis_wirogaramemi_dofufira.pdf
    • http://files.thefilamentstudio.com/uploads/1/3/1/6/131606035/fakesijerisaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/debivoruwedewekukurag.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/rufumagaxenedaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/5006/files/57550097996.pdf
    • https://cdn.shopify.com/s/files/1/0433/7444/4694/files/carbon_fibre_manufacturing_process.pdf
    • https://cdn.shopify.com/s/files/1/0435/7813/0593/files/zaregemaxorisokenekarekut.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/alimentacion_saludable_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3462/files/94312198923.pdf
    • https://cdn.shopify.com/s/files/1/0428/7220/9574/files/zuwujikifulatekom.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0796/files/lafezofitufo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0409/8722/files/acrobat_xi_reduce_file_size.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_off000042a3.bin
d4e6e2651b41d732c53660664c2aaa3bce72a11a3dc65c25eff7b2ad91638b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42A3 5092 bytes
font_01_sfnt_off000053d3.bin
09f78c69eba363c572f01fe226a812b8d53a76a6a6a11e495a7731003769b2de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53D3 9392 bytes

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