Malicious PDF — malware analysis report

Static analysis result for SHA-256 87016d21d1aeb91a…

MALICIOUS

PDF

32.6 KB Created: 2020-08-30 03:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a982ef98fef94ec31fe630cea4ab19a4 SHA-1: fcc5387a0911b3fd624152011de568052f064e6d SHA-256: 87016d21d1aeb91ad7cdb1e4e4c5bee089a76a142d018c2b9c95fe257bc2bce5
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, a technique often used in SEO poisoning or to redirect users to malicious sites. One such link, 'https://ttraff.me/wix?keyword=sal+zap+alltech', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to this malicious URL, reinforcing the attack pattern.

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.me/wix?keyword=sal+zap+alltech
    • https://static.usrfiles.com/ugd/b8c837_eb335737a47b4a68aba77d7ba136fa2a.pdf
    • https://static.usrfiles.com/ugd/7f46b5_0c6cbbc7191f4a23a808e6d05586cc32.pdf
    • https://static.usrfiles.com/ugd/b58d21_a675977f24c546a3b5cba49d8a64104e.pdf
    • https://cdn.shopify.com/s/files/1/0432/3534/4539/files/14663479118.pdf
    • https://static.usrfiles.com/ugd/b3bc21_7ae86c2e8ccf4739a925de73e31b1f06.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbaaeef765e44aec8c019e6d1b63adac.pdf
    • https://static.usrfiles.com/ugd/b8c837_993db186f751429cb6ebaa06b521f5f5.pdf
    • https://static.usrfiles.com/ugd/e1c37d_ed2e03543d25495ab22fd270fae054e7.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifizazuxapi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1213/6855/files/78894381734.pdf
    • https://cdn.shopify.com/s/files/1/0434/1733/8005/files/activex_control_in_vb.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/71759417490.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_off00004350.bin
7c0f2e80b9c95c9260e69ec05e95c3f472b36921d638ca565b573e3e969b9cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4350 4900 bytes
font_01_sfnt_off000053f7.bin
b19c064451b5bf3796a79f575b4c4097604ef7093d3d2cc659d08f0154e3e8b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53F7 9700 bytes

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