Malicious PDF — malware analysis report

Static analysis result for SHA-256 b841bfb7b45d895c…

MALICIOUS

PDF

41.8 KB Created: 2020-08-29 18:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7a919242c0965490b60cbdd1572d55d SHA-1: 113d3b2b5e29b61cba273d1a4a7b36e681b28806 SHA-256: b841bfb7b45d895c8f01ec7abc29e1617672776bdb411571c6bc0a681d6ea9b4
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, specifically pointing to 'https://ttraff.cc/wix?keyword=pre+k+worksheets+matching'. This URL is embedded within the document's body, disguised as a link for 'pre k worksheets matching'. The presence of a large number of external PDF links also suggests a link farm or SEO manipulation tactic. The ML classifier strongly supports the malicious verdict.

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.cc/wix?keyword=pre+k+worksheets+matching
    • https://cdn.shopify.com/s/files/1/0436/0726/1341/files/wusosagixafeneno.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/41537441182.pdf
    • https://cdn.shopify.com/s/files/1/0431/7629/6614/files/brother_mfc-_j4510dw.pdf
    • https://static.usrfiles.com/ugd/b8c837_958296bf50a54ab59f4d998d3d98c7f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_86d72fb87252438da66d9ef3052ab444.pdf
    • https://static.usrfiles.com/ugd/590778_f9196249b24f489ebf660512b2ff15fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddc0630f1c2343548252af4e0678ed85.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7461/files/company_car_maintenance_checklist_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/campbell_biology_9th_edition_test_bank_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3462/3643/files/tojutinuwo.pdf
    • https://static.usrfiles.com/ugd/9cc572_62130e98220244c69091b1192763afb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_70ecd7a810a944bd9e73a6ad259d29e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0018bb3149a436194e978a19552e0c3.pdf
    • https://static.usrfiles.com/ugd/de65f7_504e455ffed5414f92120a78b04c796a.pdf
    • https://static.usrfiles.com/ugd/efb3f0_e8fd8ec910064eb79273dbf2d7033248.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_off00006368.bin
6c3c8fcdc93e087b98e36dfb8e8c87cd2526f551cf536b2b6cf18fc9b0030732		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6368 5336 bytes
font_01_sfnt_off0000757a.bin
ce0423e539ebb1e13c2a66aa9fa52b57dcd1ba60f49382ea95341c4122e6caf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757A 10656 bytes

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