Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9aacbf2f4360ba9…

MALICIOUS

PDF

41.5 KB Created: 2020-08-26 01:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a95954ac2c73f6fa302b09713aa06c6c SHA-1: e607ee54ea3ec07b0a15a9dc6f59e066dfeef2a2 SHA-256: f9aacbf2f4360ba94638bbd1cdef1763901077b4ba828e50ec9c50a4dfd1e087
150 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/pify?keyword=similes+worksheet+grade+2, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'similes worksheet grade 2', which is likely a lure. The presence of numerous other links to Shopify-hosted PDFs, while individually benign, contributes to a link farm pattern, further indicating malicious intent.

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=similes+worksheet+grade+2
    • http://mabawusiz.sydmocreativeco.com/uploads/1/3/1/6/131606457/nonuminusasoxo_wepoxasagavu_wimolu.pdf
    • http://satuf.jenniestrobel.com/uploads/1/3/0/8/130814328/5610732.pdf
    • https://cdn.shopify.com/s/files/1/0430/6196/9057/files/epidemiology_of_amoebiasis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/9207147289.pdf
    • https://cdn.shopify.com/s/files/1/0428/2286/0966/files/moxinuwovojileterusebirim.pdf
    • https://cdn.shopify.com/s/files/1/0437/6746/4085/files/radiestesia_clssica_e_cabalstica.pdf
    • https://cdn.shopify.com/s/files/1/0433/8276/7779/files/jomalowepajosekubixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/17045120637.pdf
    • https://cdn.shopify.com/s/files/1/0432/3069/1496/files/73119488246.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9863/files/the_fifth_wave_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9064/1045/files/zidivenunozuvamu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0452/3973/0336/files/banking_awareness_arihant_publications_download.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_off0000636b.bin
2f3e40ef1927a9e7e42928d67afa1da521e8afcbd7b3fbbb419c20d2a26b0bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636B 5628 bytes
font_01_sfnt_off00007670.bin
b5f0db88dba7caf253893b5cc9f015620935222eafae9b2c9461f92fec8b4fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7670 10344 bytes

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