Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcc3b6671dbe6e3…

MALICIOUS

PDF

49.3 KB Created: 2020-08-15 14:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03de6f2aa09456f230abd9fde2223207 SHA-1: 1540dd23aebb913f9ff05510677fdb10802af5ad SHA-256: cbcc3b6671dbe6e3fbe0ce8b50b001c691a805a7dbe2f826894b1b1438623cfb
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, many of which point to external resources, including a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wb?keyword=quantum%20numbers%20questions%20and%20answers%20pdf, which is flagged as malicious. This suggests the document is designed to redirect users to malicious sites under the guise of providing information.

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.ru/wb?keyword=quantum%20numbers%20questions%20and%20answers%20pdf
    • http://zudina.champagnesparkle.com/uploads/1/3/0/7/130739227/gedajobuvegu.pdf
    • http://files.christopherjohnsonarted.com/uploads/1/3/0/9/130969241/1443521.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/60127566201.pdf
    • https://cdn.shopify.com/s/files/1/0434/2854/4668/files/52689130281.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/broiler_feed_formulation_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/lakunanufoladetuxeli.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/68695190306.pdf
    • https://cdn.shopify.com/s/files/1/0437/0661/3912/files/96790482223.pdf
    • https://cdn.shopify.com/s/files/1/0430/7179/9449/files/prl_impact_factor.pdf
    • https://cdn.shopify.com/s/files/1/0434/7504/2457/files/67581286215.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/47322968150.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/benzocaine_synthesis.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_off000078ad.bin
306a3c2791b91b6c9558bee014ca209002938abd990d2b5a89d9aba279fefa22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AD 5576 bytes
font_01_sfnt_off00008b8e.bin
3011321d0a174ff1e34588168c4e2d99ad74bc4b72c0fed0aa61ff9e04cae401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8E 14304 bytes

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