Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b012d687e9a054…

MALICIOUS

PDF

39.9 KB Created: 2020-09-01 00:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73538edf32ab9d86f5957b9adcf5071 SHA-1: b9f8478eff6a0eec2e4c8916c967ec3e44352d52 SHA-256: 89b012d687e9a054dff79caf2fef706fbcf86fe5b418dfc4d1317504e3426504
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=google+cloud+print+setup'. This URL is presented within the document body, disguised as a Google Cloud Print setup guide. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive link.

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.com/wix?keyword=google+cloud+print+setup
    • https://static.usrfiles.com/ugd/b8c837_51008b3ebb6c4a108d4d409110cdd17b.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f6adbaeb7cd4742a24e39027182f8a7.pdf
    • https://static.usrfiles.com/ugd/191a6d_41421a8f69984ca981bbdaff644add8b.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/34014066998.pdf
    • https://static.usrfiles.com/ugd/d775a9_6d0526663ddd450b9fd985b142f446dc.pdf
    • https://static.usrfiles.com/ugd/ab059d_48ec28facdf7455ea78615d3d97fbfa1.pdf
    • https://static.usrfiles.com/ugd/0df15e_bc1fc0e9b7bd40b79d5fecdc2e2e0a7a.pdf
    • https://cdn.shopify.com/s/files/1/0433/5324/3816/files/rudowalutafitisowiwuso.pdf
    • https://cdn.shopify.com/s/files/1/0466/8499/5748/files/twin_stim_plus_3ra_edicion_manual.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_off00005ea0.bin
eaabd3f8bb2622ac0e88758385754f4ac945976531252e22edf15a6e6f722aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA0 5060 bytes
font_01_sfnt_off00006ff1.bin
2063fc27a77cc978ab4b95ba1dc4a6fba78c91249bf6511af4b5e524fff6bdc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF1 10468 bytes

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