Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa194313f96c34c…

MALICIOUS

PDF

38.4 KB Created: 2020-09-07 12:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 887e701f9c9c657adf362566c60c37a1 SHA-1: 5129d1dba59b5f87154b9c1228a321d23136194c SHA-256: 1fa194313f96c34cc1b18400c4ae1ff619c073e0a64706e9ed35cdd9abaf1995
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 'https://ttraff.club/wix?keyword=volume+of+cubes+and+rectangular+prisms+worksheet'. This URL is embedded within the document's body, disguised as a worksheet. The PDF also contains a large number of external links, many of which point to 'static.usrfiles.com', suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector.

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=volume+of+cubes+and+rectangular+prisms+worksheet
    • https://static.usrfiles.com/ugd/0010c8_7971bf6f21fc468f8c8b4f1986d721ae.pdf
    • https://static.usrfiles.com/ugd/c70c35_d1a7f6a9ddc046eeb5c993aec6c629ba.pdf
    • https://static.usrfiles.com/ugd/493135_ba13cb5c2afc42bcb4cbea5d43f2b81a.pdf
    • https://static.usrfiles.com/ugd/69a512_b62b180c5da64e1090c0d42c50e90fea.pdf
    • https://static.usrfiles.com/ugd/ed64d2_dd08a308ef5e4dbc824ffb02d2d01deb.pdf
    • https://static.usrfiles.com/ugd/d954c5_d8f5a936796c4f319f07b2feb6e5b952.pdf
    • https://static.usrfiles.com/ugd/078c79_f3f9466409934ae8b5285062cea0138e.pdf
    • https://static.usrfiles.com/ugd/158fb9_3cc80fa35e01460f89685b9a2fc55e80.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_d20d26fe70a84fc79d9d7e48e6f0d8bb.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/getakuzuxukedasalite.pdf
    • https://cdn.shopify.com/s/files/1/0461/1476/7012/files/vavukamebuvi.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_off000056e8.bin
2275c14cb9a7b7931302035e6b517c2d2a5b0e5f15a2263c0cd6469ccfe5e379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56E8 5832 bytes
font_01_sfnt_off00006aab.bin
02ee5fa448194782718492205371452540d07a7173be436c95bb9f8258ed60b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAB 10060 bytes

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