Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a2c4546720e606…

MALICIOUS

PDF

45.1 KB Created: 2020-08-31 06:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8d9f6dc278991fdc6a2ead6a43321a7 SHA-1: 0bf63071af0387a490a27117855c1ca961a353d8 SHA-256: f9a2c4546720e6065eaafc75b7536c091fb0e9e54109c9b2f1153e355ecb2d45
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a PDF link farm. One of these links, 'https://ttraff.cc/wix?keyword=makey+makey+circuit', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other benign-looking PDF links, suggesting a social engineering attempt to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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=makey+makey+circuit
    • https://static.usrfiles.com/ugd/0779a3_cf18041bce044ed986cf01e1c3cbae43.pdf
    • https://static.usrfiles.com/ugd/c1de29_459c0334073e4f6e92b3757bc9d30e00.pdf
    • https://static.usrfiles.com/ugd/b8c837_99d91dbbce9b448ba795b7bd3e02dcd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_1424bd56622a4d56a1e2ca8feeba0a69.pdf
    • https://static.usrfiles.com/ugd/b0b521_4ca8ebf0a7b749299c3a9d27155b628e.pdf
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/7326562788.pdf
    • https://cdn.shopify.com/s/files/1/0434/5449/6935/files/logica_filosofia_aristoteles.pdf
    • https://cdn.shopify.com/s/files/1/0430/9912/7959/files/structure_et_fonction_de_l_appareil_de_golgi.pdf
    • https://static.usrfiles.com/ugd/d94ae5_a6b83ec63c034555960b0c34f7a52278.pdf
    • https://static.usrfiles.com/ugd/b8c837_c762cac771034d9f9681d8e751bb0e0c.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/bovonenejov.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/e5_a4_a7_e8_84_9a.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/77387703764.pdf
    • https://cdn.shopify.com/s/files/1/0430/5128/6690/files/welubugafidela.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1480/files/51099124377.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_off000073a9.bin
08ab06b8aaaacf69fac3bdbd8a257ec6fb3ebdca987b93f31ea42831e2e2e717		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A9 4908 bytes
font_01_sfnt_off00008451.bin
ba11044b70fb6459987756b925c7e3af4e0e83d23c65a9e9ee70377f4f13c636		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8451 10488 bytes

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