Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d8d705ca3ea34f…

MALICIOUS

PDF

48.9 KB Created: 2020-08-07 23:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0a20e9f3b75d92b1e78b1cec920fa52 SHA-1: cf4ff053b8d901947c632d6a3df9567607166fa0 SHA-256: b7d8d705ca3ea34fbb7f50306b780497f1d29020f0fa8fe61229c6c7cb6a198f
150 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'Atmega8 pin description pdf' and the malicious URL, suggesting a lure. The presence of numerous external PDF links, many hosted on cdn.shopify.com, indicates a potential SEO manipulation or link farm tactic to distribute malicious content. No scripts were extracted from this sample.

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.cc/pify?keyword=atmega8+pin+description+pdf
    • http://files.tntchildcare.com/uploads/1/3/0/8/130814070/7689a5.pdf
    • http://files.ricky-liquor.com/uploads/1/3/0/7/130775658/noforawafowu_risukiw_zowul.pdf
    • http://peluko.gaggiamanualservice.com/uploads/1/3/0/8/130814297/pinaziv-lewom-lekono.pdf
    • http://files.cloud9science.net/uploads/1/3/2/6/132682124/b67c7bb9e3.pdf
    • https://cdn.shopify.com/s/files/1/0430/0662/3903/files/54970445682.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/causes_of_pollution_in_mumbai_city_project.pdf
    • https://cdn.shopify.com/s/files/1/0434/1697/7559/files/54366751196.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3130/files/xogadifegijar.pdf
    • https://cdn.shopify.com/s/files/1/0437/1959/0040/files/comparing_numbers_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/11617426755.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9667/files/98642807426.pdf
    • https://cdn.shopify.com/s/files/1/0436/2056/5156/files/76456362949.pdf
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/vubave.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/129443181.pdf
    • https://cdn.shopify.com/s/files/1/0440/3258/9989/files/57657412178.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/wolejodewatowiviv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8113/8343/files/kobewogezavuwavamegi.pdf
    • https://cdn.shopify.com/s/files/1/0449/0670/9159/files/2nd_grade_math_challenge_worksheets.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_off00007ee3.bin
718b42238e8b85b01d5d2b116609dd59b4b383c69e8db91c722bf46a79cad82a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE3 5628 bytes
font_01_sfnt_off000091fa.bin
b42c998e614673f7f4d51ddb66c4cb9c12acbcea09d1b092817931da07866c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91FA 11356 bytes

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