Malicious PDF — malware analysis report

Static analysis result for SHA-256 56311826bc52dc36…

MALICIOUS

PDF

35.8 KB Created: 2020-08-31 08:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06f2cfe320dd42a6eefaed393c35fe16 SHA-1: 9f87094307ce225340648e580e7678aa8a012c3b SHA-256: 56311826bc52dc36be0d733db03fdc9fe9298cc9a125af13fd0141cf4a1cf398
150 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of embedded links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious redirector URL and the sheer volume of embedded links point towards an attempt to lure users to potentially harmful content.

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/wix?keyword=crucigrama+de+fracciones+y+decimales+resueltos
    • https://cdn.shopify.com/s/files/1/0433/8886/2622/files/total_gym_1000_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0445/5025/8852/files/cosmic_love_jan_spiller.pdf
    • https://cdn.shopify.com/s/files/1/0434/4951/6199/files/pdf_to_word_document_i_love.pdf
    • https://cdn.shopify.com/s/files/1/0435/8527/4024/files/vakawibefavojifobemupasoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/9003/2278/files/bangalore_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/3501/7895/files/kuvume.pdf
    • https://cdn.shopify.com/s/files/1/0449/7945/4111/files/favirow.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/kitagufenubetozomemuja.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8194/files/lord_of_the_rings_minecraft_map.pdf
    • https://static.usrfiles.com/ugd/12f4eb_b6432d423fec48b38d050640fd439e6d.pdf
    • https://static.usrfiles.com/ugd/cf14a4_f2819cd47e864b0b8a4a53a749e40127.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_off00004a82.bin
836f0eafe561e030827637befc039e270706491fc9a577708ed2628bb6acd78d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A82 5348 bytes
font_01_sfnt_off00005ca0.bin
3dd311d7f3e70567bb90bd382f250cc03baed0a1ba33045299b54609018bcfec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA0 11080 bytes

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