Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6634397dcdd3229…

MALICIOUS

PDF

62.9 KB Created: 2020-09-06 03:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 601636a0caaa18c3bfcd2467fd364e13 SHA-1: 48750c272743904ad2aaf02941be379b5704209b SHA-256: c6634397dcdd3229e3bd5d7680fa8183443c2d07ce658fb6b3428e0309a4aa25
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to a URL that is presented as an IELTS writing sample. This link, 'https://ttraff.link/wix?keyword=ielts+writing+task+sample+answer+band+9', is the primary indicator of malicious intent. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to static.usrfiles.com, suggesting an attempt to manipulate search engine results or distribute content through a seemingly benign domain. No scripts were extracted from this sample.

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.link/wix?keyword=ielts+writing+task+sample+answer+band+9
    • https://static.usrfiles.com/ugd/b42fd6_804cf79160354104827f515cb684854f.pdf
    • https://static.usrfiles.com/ugd/529dbf_172b8a14994246e0ba5145b1270b0caf.pdf
    • https://static.usrfiles.com/ugd/b8c837_2da413f5cc3649dbbd2e5839352d23f0.pdf
    • https://cdn.shopify.com/s/files/1/0439/4637/7374/files/93090395024.pdf
    • https://cdn.shopify.com/s/files/1/0434/2395/7144/files/76408280047.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/witusexadizuvudoboro.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/53800731557.pdf
    • https://static.usrfiles.com/ugd/665c20_73c46d7da832421badbb580d34869350.pdf
    • https://static.usrfiles.com/ugd/eb4c03_744ac3e298ed48599a3e7f235a48c06a.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_cea443c4118f4c3c9ed50b36f2f49259.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_08fbfc68f7f9462397f62be08963a79e.pdf
    • https://static.usrfiles.com/ugd/2b3f46_1f6aa48d29ee420f95b027ddcda48aeb.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_off0000b16f.bin
5002142ac06a751ad7ac9cc0302d864dfea2e8b1139785100d958679d24f4c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB16F 5668 bytes
font_01_sfnt_off0000c4a9.bin
5ece5e7d0d07cd8bb4aee3041f245efb553b3d12bacf11f5051ab4e55aa77d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A9 13308 bytes

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