Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf31f01ab186864…

MALICIOUS

PDF

43.4 KB Created: 2020-08-30 02:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57bdbdf496b48bb139ac04334e2d9081 SHA-1: cdcfada92ee5266034e621598f0f3bda3502c804 SHA-256: aaf31f01ab1868642089f0b6833722013220821cb5318504653ae1ebaeb16bb6
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are generated SEO-style links pointing to Shopify. One of these links, however, is a known malicious redirector. The document body, though heavily obfuscated, contains the string 'Bjj syllabus pdf' and the malicious URL, suggesting a lure to trick users into clicking the malicious link under the guise of accessing a syllabus.

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/wix?keyword=bjj+syllabus+pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/riwuvazaratamofa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/sawabulabopofegipo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5410/2688/files/wakasukugaxelifirakevugob.pdf
    • https://cdn.shopify.com/s/files/1/0437/7998/1470/files/microbial_ecology.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/fafusinino.pdf
    • https://cdn.shopify.com/s/files/1/0463/9650/6267/files/email_reminder_google_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0448/2914/7293/files/clinical_biostatistics_and_epidemiology_made_ridiculously_simple.pdf
    • https://cdn.shopify.com/s/files/1/0430/2841/4618/files/89012630984.pdf
    • https://cdn.shopify.com/s/files/1/0461/2168/1060/files/a_rooted_android_phone.pdf
    • https://static.usrfiles.com/ugd/2b25b5_da1be6692edc4637865e3509ba17dbbd.pdf
    • https://static.usrfiles.com/ugd/565485_103e7cb34d064e7886e745e56561cde5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7c66bdfd47e45849508a83533fc6e57.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2c4bba5127a4c2b93fd32c817457492.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5b202edd1044a25b199b1d41445b8c9.pdf
    • https://static.usrfiles.com/ugd/565485_937bc0e89a9f42389b4affdb2c7e6d81.pdf
    • https://static.usrfiles.com/ugd/3be3a7_e9770c8d90d34b8daaf4d32de56e438f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c6230a38605477197fdd2c6bfb057e7.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_off00006cd3.bin
1c9294d0ddf3cdbfb533e80491fdf5659eb2723c27bfa31aaf1cdab493d53eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD3 5304 bytes
font_01_sfnt_off00007ef7.bin
beacd291921f165ef37cec79705e179083da99306f72e891481507007ee041bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF7 10060 bytes

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