Malicious PDF — malware analysis report

Static analysis result for SHA-256 f875b2a965799d17…

MALICIOUS

PDF

35.5 KB Created: 2020-09-09 17:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4705092f578520a3fc8792a9e72ad2b SHA-1: 780b583cdaa2fb85a8769e307144adbf0be81475 SHA-256: f875b2a965799d17b7d8b537009cf676b64c9f30dd9fbfdb32a98edac125b184
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the same keyword used in the malicious URL, suggesting a lure. The presence of numerous other PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely to improve SEO for the malicious redirector. No scripts were extracted, and the primary malicious activity observed is the redirection via the embedded URL.

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.club/wix?keyword=ashcroft+technology+academy+sixth+form+application
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/16538159403.pdf
    • https://cdn.shopify.com/s/files/1/0462/2958/6069/files/grohe_shower_faucet_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/aptoide_pc_windows_7_gratis.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6c190f4b6494997a8f83f845ef1045a.pdf
    • https://static.usrfiles.com/ugd/0789d5_3bec501f2a58467dbd1b080796f7c815.pdf
    • https://static.usrfiles.com/ugd/f967ac_05793897074848b2adb6e84a1a58a5d4.pdf
    • https://static.usrfiles.com/ugd/704566_6205bdb23ffc476cb2f55128dd64d269.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f1532a2c80a424cbfe51b4caba5ce6c.pdf
    • https://static.usrfiles.com/ugd/c57cae_518ce632b1e54fa799d79ec3c7a75d41.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_da6a72b04fee450b8244ddba36d6ff2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_33831c1fddeb48aea40e27317376388d.pdf
    • https://static.usrfiles.com/ugd/02631b_03ec7c93a83748c883263ae1f0dd6c60.pdf
    • https://static.usrfiles.com/ugd/05301a_3fcca677e44044e9b930b64497ed05ed.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_off00004b79.bin
cffb74bcfccd077dd8f38b2ed99a5aad63d9f58d44137617b31899b6095891ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B79 5728 bytes
font_01_sfnt_off00005ee2.bin
5029c5f664b50fbc6d053754ab31c067ae25e96f6dd97d6a6b56d2e7e7f35802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE2 10088 bytes

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