Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e08b05c93796d75…

MALICIOUS

PDF

36.8 KB Created: 2020-09-06 21:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a5290a6416dd8f471bda78e622a8bec SHA-1: c75290f53407da121649807c003978ba6d1a1021 SHA-256: 8e08b05c93796d75ddb786a45051727975c37385bd83ec1c57a71aa53fbcd4a2
92 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with text related to 'Ks2 mental maths questions and answers'. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to serve further malicious content or phishing pages.

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.link/wix?keyword=ks2+mental+maths+questions+and+answers
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/42358466143.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/62874204798.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/xivamivupex.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/pejiko.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/fasilegosiwapasivi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3246/0960/files/saxakobixazitol.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4220/files/common_cardiovascular_diseases.pdf
    • https://static.usrfiles.com/ugd/a9248e_e0fd9a4b6beb42b484569b36de647de3.pdf
    • https://static.usrfiles.com/ugd/97368a_4317854b33554b8582fe2e6026192e93.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_off000052b1.bin
e8cb14fba3383911541e284f18ebd07b9542ac21da2a62903529ae7750bc9d55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52B1 5384 bytes
font_01_sfnt_off000064e4.bin
01fbc16a0ce115a89af27eb5a340dfc149ccb566e87e428802f8e9dc0fbd5bd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E4 9992 bytes

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