Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f84d8515a3a909…

MALICIOUS

PDF

46.4 KB Created: 2020-08-23 23:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4a644a4db2600ce8a95affe64c02e41 SHA-1: 28d800ee88bdcc0d1b119c9018b1bb751436f2bf SHA-256: 19f84d8515a3a909d11f5b238747ae861bedc0e32ec985a7a162dc6456da4a28
90 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to 'ttraff.cc', a known malicious redirector. The document's content, disguised as a worksheet answer key, is a common lure for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 2

  • 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.
  • 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=cpctc+worksheet+answers+solve+for+the+variable
    • http://zasadapum.holdenshouseco.com/uploads/1/3/0/7/130775519/3a78a7dedf9006b.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3970/files/80811598749.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8890/files/tonewijuxalulabejelu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2173/files/bizowalo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/42340115016.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/factoring_quadratics_quiz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/mibigenupufonenotekesu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/suledigiledogunisomozi.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_off00005922.bin
bc830781c8c81b7ba84ab57c05cc51ff9f85345af6f9a4f1c7bc9bb2bcfcc8e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5922 5364 bytes
font_01_sfnt_off00006b6d.bin
51dea5b7e172afc29e7b3f36ca408ecce33a0ab56fb0e049a4ae26e0c3354cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6D 13792 bytes
font_02_sfnt_off0000974d.bin
d05f37f1530d5f93420ec1d1fef03be40ff404ab4da44f5daae16fd0829d120f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x974D 16168 bytes

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