Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82f6816010a2463…

MALICIOUS

PDF

37.1 KB Created: 2020-09-13 00:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 069966e01e5a2ad906d95a2ac961ee59 SHA-1: 76f4134e713c44f2c3c1e572deff8d579e451a78 SHA-256: a82f6816010a2463c26bff03d85c94ff698de909d7e60b474f0c75032a725939
150 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many of which are hosted on domains designed to appear legitimate but are part of a link farm. One prominent link, 'https://ttraff.me/wix?keyword=everfi+finlit+cumulative+exam+answers', is identified as a malicious redirector. The document body, though heavily obfuscated, contains similar URLs, suggesting the primary goal is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=everfi+finlit+cumulative+exam+answers
    • http://files.gailnathansonpaintings.com/uploads/1/3/1/3/131398428/vovilawerut.pdf
    • http://tumil.sunflowergenetics.com/uploads/1/3/0/7/130775493/juxesibejabuf.pdf
    • http://files.qualityfolk.com/uploads/1/3/2/8/132814138/5092812.pdf
    • http://files.kevinmoldenhauer.com/uploads/1/3/0/7/130775727/3551192.pdf
    • http://bojixiso.transformational-school-of-essenian-arts-of-healing.com/uploads/1/3/0/7/130739267/pavivemakawoserikoxe.pdf
    • http://ligus.heathergeoffrey.com/uploads/1/3/2/3/132302870/165b9f5.pdf
    • http://files.captiv8designsusa.com/uploads/1/3/0/7/130775427/7359726.pdf
    • http://files.nataliesegall.com/uploads/1/3/1/4/131407012/401454a6f8b.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2645/files/dezopegolalibap.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/avast_mac_os.pdf
    • https://cdn.shopify.com/s/files/1/0429/7362/6524/files/gafawazufefisamumawid.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/gevikubexenuxaxuma.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/1037408827.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/5006/files/21784318021.pdf
    • https://cdn.shopify.com/s/files/1/0428/0965/5462/files/reactions_of_alkenes_worksheet_with_answers.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_off000052c4.bin
7f99259303438e18729792c5abc9c92cc6733ede8a30bd4cecd9d8c755c58aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52C4 5204 bytes
font_01_sfnt_off00006478.bin
f9588f0d2828dd367811efb9dc348f35fd77b77fe129e50cabaadab4b79bb30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6478 10288 bytes

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