Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c37a2382b7b630…

MALICIOUS

PDF

38.2 KB Created: 2020-08-08 15:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dc5f01d9de5b0e8d80c3dfeeb534a63 SHA-1: 72725aee06c50e5302a10761ed71cd012fb33318 SHA-256: e1c37a2382b7b6302ea636491db2a138649840282b817a5d141914e213384014
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its structure, which includes a significant number of embedded links to external PDF files. One of these links, 'https://ttraff.ru/pify?keyword=noun+adjective+and+adverb+pdf', points to a known malicious redirector. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly innocuous links.

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.ru/pify?keyword=noun+adjective+and+adverb+pdf
    • http://files.strongholdrealtyga.com/uploads/1/3/1/3/131381772/1166121.pdf
    • http://files.thesugarqueen.net/uploads/1/3/0/9/130969726/zuvuwuvawubizozita.pdf
    • http://files.visitkaunas.net/uploads/1/3/2/7/132712011/lojojase.pdf
    • http://files.torahfun.us/uploads/1/3/1/6/131636956/3d4122878.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5798/files/womav.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/votodudemiduforufebup.pdf
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2903/files/46541057398.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4364/files/bezibixili.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdf
    • https://cdn.shopify.com/s/files/1/0437/0402/5242/files/basic_chinese_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1220/files/plot_normal_distribution_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/jexupubuzadanusenuzip.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4020/files/7187405218.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_off00005889.bin
a805ebad7939ecd9668a9f7b5e6935ca6ab1f65363750d442eee44f723db9f9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5889 5184 bytes
font_01_sfnt_off00006a4c.bin
c842fe11e810a74b055609c5fe19cbf5ba300d8f64eec02dfa7400e32ba493f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4C 9900 bytes

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