Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dde306cca81554…

MALICIOUS

PDF

34.2 KB Created: 2020-08-30 12:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a7cad890beb55bdf98fe2fa18a8eace SHA-1: adeaf7f7fe0e0c9a0225801dcad6882831bba54f SHA-256: a5dde306cca81554b103d4469e3f9b97ccd463215c8f4a5e68a7e95c8bc09b2b
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=paranoia+rpg+forms'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same redirector URL. This suggests the primary intent is to redirect the user to malicious infrastructure, likely for further exploitation or credential harvesting.

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=paranoia+rpg+forms
    • https://static.usrfiles.com/ugd/a298ce_e665dd6055a540b799037bda788d47c1.pdf
    • https://static.usrfiles.com/ugd/23e9be_38c0f5b39a7b459a838076b9ff358d7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1c55af24b0a4521af701ff3025378bd.pdf
    • https://static.usrfiles.com/ugd/93c935_ef7e034737af4aa6bec92fe819074878.pdf
    • https://static.usrfiles.com/ugd/73cb9e_7789ac8f58d94a64983cdcff3feb9e48.pdf
    • https://static.usrfiles.com/ugd/8acad3_b81f51c033d64ec8956f14f173dd2658.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/mumeda.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9605/files/what_is_ahci.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xogasetixudaxaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/8705/9362/files/2071616103.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/53805513470.pdf
    • https://static.usrfiles.com/ugd/98e298_c9cd167c686940e79a537a8cda37b44a.pdf
    • https://static.usrfiles.com/ugd/b13fd1_4e7e2ddc7f1d4fab9edb36113e8d7240.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_off000048da.bin
fcbce6cdaa6fc43e80a868ae442124976eae0d95671fd2c0e81df7456ae1841f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48DA 5188 bytes
font_01_sfnt_off00005a69.bin
7b6b1fbd90b2fcd1dc5c40971a4ff121a6fc0082491dae204a53c50a0769178f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A69 10020 bytes

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