Malicious PDF — malware analysis report

Static analysis result for SHA-256 f329dcd9e69f9f82…

MALICIOUS

PDF

37.1 KB Created: 2020-08-30 23:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05229265279ff15f9a36b7a80c0350e8 SHA-1: 8356e3f97f99dd4498bcfa080a2551c93f417341 SHA-256: f329dcd9e69f9f82eab438a3a7f4e44644d8831759b0b0f9190ca1ba15d23fcf
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=imagen+de+corpus+christi'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://static.usrfiles.com/ugd/f84671_db8be3aa70ab44f381099302952117da.pdf'. The ML classifier also flagged this PDF with high confidence. The document body is heavily obfuscated and contains the malicious redirector URL, suggesting an attempt to lure the user to a harmful site.

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=imagen+de+corpus+christi
    • https://static.usrfiles.com/ugd/f84671_db8be3aa70ab44f381099302952117da.pdf
    • https://static.usrfiles.com/ugd/a838c0_d1cf16d5bb354662b898ab11d707eee6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1945de8c2834e48916708e4aeb9e4e6.pdf
    • https://cdn.shopify.com/s/files/1/0460/3615/6575/files/3ds_bios_for_android_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8938/7935/files/the_outsiders_book_online.pdf
    • https://cdn.shopify.com/s/files/1/0447/7625/9735/files/calculus_by_thomas_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7738/5892/files/24495473469.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/financial_accounting_weygandt_9th_edition.pdf
    • https://static.usrfiles.com/ugd/b8c837_d345e268873f4e8cafee38c42d1886bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e79f68748764c67853f151d03d51f4b.pdf
    • https://static.usrfiles.com/ugd/e6092c_5af621cc87a341899aefd456d6a2c8d9.pdf
    • https://static.usrfiles.com/ugd/d94ae5_921365a059274ec1861a1a175b1dec48.pdf
    • https://static.usrfiles.com/ugd/e2b09b_30b996da604c4985a873c804b44e500d.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/jurnal_tes_cfit.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/37647470721.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2672/files/antivirus_software_free_mcafee_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/40159782200.pdf
    • https://cdn.shopify.com/s/files/1/0438/0839/1330/files/adobe_acrobat_reader_pro_9_free.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_off0000519e.bin
ab07c7a06d47218a74b889bc98565fa0cc32cb43588523f17a3f6fa1867efbc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x519E 5392 bytes
font_01_sfnt_off000063b7.bin
e19ac8b909f972893ecbf898dbda5726df2aa4f18f5c1cb878ea9a2763f4d228
pdf-font-stream PDF embedded font (sfnt) at offset 0x63B7 10416 bytes