Malicious PDF — malware analysis report

Static analysis result for SHA-256 8305354f6b07b7ef…

MALICIOUS

PDF

49.7 KB Created: 2020-08-22 22:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1ab7c68fc3cd89b3c9cd1d84a61451f SHA-1: 20011da1e9b82710971dfb298ce84c80ebcc01a1 SHA-256: 8305354f6b07b7ef830bdf19f03a5c965e401509b912e3142a1389fc748f65b4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is presented as a tool to recover Android mobile applications. This indicates a phishing attempt to trick users into downloading potentially malicious software. The ML classifier strongly flagged this PDF as malicious, supporting the observed malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=android+mobile+recovery+apk
    • http://files.ethos-amcww.org/uploads/1/3/1/6/131606550/venawipudato.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6827/7404/files/sefevapijevomegepibi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7462/files/97860158045.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/gupubobubufeduxofuwo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1975/3879/files/define_collective_bargaining_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0432/2829/9428/files/jegegabivufovadijugokoron.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9906/files/ielts_reading_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6165/files/kirejuregufabemavewekos.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007932.bin
d6519bba7e918f2fce1d73b5325a85e418a00a2b446fcc2804d82e50cad3fb7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7932 5396 bytes
font_01_sfnt_off00008b77.bin
5e0190b2bba05820f7e2821e65ae33d11ba21345cfc36020a3de40431601bfcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B77 14920 bytes

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