Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fb008001e2ae38…

MALICIOUS

PDF

41.4 KB Created: 2020-09-01 10:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02fc5d109ef280908ba17fb7ae2f168b SHA-1: af38dacb1604cbacb438567986f803451e897164 SHA-256: b5fb008001e2ae38b9885c3e6f216d31585d252f1b775f9eb0edc42065cf0990
150 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to a known malicious redirector, disguised as editable party invitation templates. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same lure text and URLs. The primary IOC is the malicious redirector 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.cc/wix?keyword=editable+party+invitations+templates
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/27993350272.pdf
    • https://cdn.shopify.com/s/files/1/0429/4272/6310/files/28871993045.pdf
    • https://cdn.shopify.com/s/files/1/0429/2519/5427/files/zelekevazupafupo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53293114795.pdf
    • https://cdn.shopify.com/s/files/1/0461/6500/0344/files/anti_discrimination_board_complaint_form.pdf
    • https://static.usrfiles.com/ugd/405339_f2de7bb2eac24b5cae06da5b1f804360.pdf
    • https://static.usrfiles.com/ugd/87a178_9922ebd76b3140f3ad859bb0d0ff10a5.pdf
    • https://static.usrfiles.com/ugd/405339_4a1d85b470124a02b25f2a1364b78ed8.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bf4c146d25743d1b72ffe676366da53.pdf
    • https://static.usrfiles.com/ugd/2d1648_02505527f2a74c76b11e43f6fd45fca9.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7d0ab5766f84394b7ff5b7b6bbdaa02.pdf
    • https://static.usrfiles.com/ugd/96bf9d_b0eaf5de9fff4bed9e9419c14ae97d1f.pdf
    • https://static.usrfiles.com/ugd/18f527_562ea8b830294f9cb9eb945eb99bb91e.pdf
    • https://static.usrfiles.com/ugd/9a242c_26083feaaeec4d25ac6f18a747effa32.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_off00006484.bin
c5b66e7cc12da6fe33b1ee141514c0d04a5f2721a46aa65cf7ad020f2b3fe853		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6484 5364 bytes
font_01_sfnt_off000076b1.bin
4e895c75016422d5c7da0820d530dadd3cd6e050e3686eeff6d39a1d659a4fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B1 10028 bytes

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