Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff911ffa88beca81…

MALICIOUS

PDF

59.4 KB Created: 2020-09-03 12:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 974d05d786fa7f4d7a48b0564480e8f1 SHA-1: dbcbd64a6c27380dc994afde24e3d74a11dbb00e SHA-256: ff911ffa88beca8116381ca6645f78643b421b30c27f69b5a139b9542e5e5636
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=bollinger+bands+explained+pdf'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect the user to malicious 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.ru/wix?keyword=bollinger+bands+explained+pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ninitegabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2614/files/29671465421.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/nithya_and_beril.pdf
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/72617463910.pdf
    • https://static.usrfiles.com/ugd/409ca8_e50a814cbac243988c65a7a25897206b.pdf
    • https://static.usrfiles.com/ugd/9bd82e_0bd3f0c01f264ab786ca31b2c58a8dcb.pdf
    • https://static.usrfiles.com/ugd/2eec94_0ee39869fbc94e20ae6353a205b0cee7.pdf
    • https://static.usrfiles.com/ugd/565485_68eb55bb875441ec8d98c08a7ef0fc40.pdf
    • https://cdn.shopify.com/s/files/1/0433/7424/8101/files/30896865261.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/rinasilari.pdf
    • https://cdn.shopify.com/s/files/1/0440/0034/6270/files/63125876846.pdf
    • https://cdn.shopify.com/s/files/1/0429/7873/8335/files/32777204586.pdf
    • https://cdn.shopify.com/s/files/1/0448/5372/3296/files/bjt_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/3562/1536/files/folumexoxogobufet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4083/2678/files/47947791968.pdf
    • https://cdn.shopify.com/s/files/1/0437/5085/0714/files/fogixesuredulefaxum.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/10781640579.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/37558586101.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_off0000a91b.bin
81f7e6efd969743f1a8d325f7f514c535b6d08ebd85a9fd3e5b30adc32f751b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA91B 5468 bytes
font_01_sfnt_off0000bbc3.bin
35fd1949e6d58a761f3226d4f4a1d2fbaceab69e7466b237cddf047f474cd65d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC3 10664 bytes

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