Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00857366bd6bd63…

MALICIOUS

PDF

37.7 KB Created: 2020-09-06 05:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f656224074da858ccd2ecd7bd5e778ec SHA-1: ae60cc320f926db6c355e70dbde92146b83a2277 SHA-256: a00857366bd6bd632beeecad8398ba2d62be4e0e11c001b011e93c5e1dba8c94
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains a prominent link that redirects to a malicious URL, masquerading as a download for 'Tencent gaming buddy older version'. This is supported by the PDF_MALICIOUS_REDIRECTOR_LINK and SE_DOWNLOAD_BUTTON heuristics. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a broader campaign. The document body, though heavily corrupted, contains fragments of the lure text and the malicious URL.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/wix?keyword=tencent+gaming+buddy+older+version
    • https://static.usrfiles.com/ugd/8b4172_85b61b5777c34d3fb2d66c9e3ee96073.pdf
    • https://static.usrfiles.com/ugd/b8c837_cda10bbc811843f98571a08821e9bc55.pdf
    • https://static.usrfiles.com/ugd/2f7815_89623526879c4d118e7ece689e196e89.pdf
    • https://static.usrfiles.com/ugd/b8c837_a52dcec19ad449e08cce8e75e85e1561.pdf
    • https://cdn.shopify.com/s/files/1/0430/8592/2466/files/nipuzome.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/personal_financial_planning_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0440/5261/1222/files/widipuse.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1718/files/10521731429.pdf
    • https://cdn.shopify.com/s/files/1/0430/6078/9409/files/witemunamatun.pdf
    • https://cdn.shopify.com/s/files/1/0435/9982/3016/files/fimivawanenixobati.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/rovibal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004be0.bin
42998d7cf5d458379acab8e4c92dc943ecd8145598a929d3c91ae73e5ba667d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BE0 2900 bytes
font_01_sfnt_off0000561f.bin
0718e33e8d5af12120be382a252a5c80ee736760f6d699b47a564825f198dc13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x561F 5508 bytes
font_02_sfnt_off000068cd.bin
933f035d2e50a52806cbe72aa2587cf34d94e1340af4ee650b6cca219b150f05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CD 9624 bytes

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