Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8c1e677bb9f38a…

MALICIOUS

PDF

37.8 KB Created: 2020-09-02 06:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 530a9ef891c8ec5a43090425f2c6c159 SHA-1: 09ca86c0b5881f4ca7f1f216a3eb8e7b12fb09db SHA-256: 6a8c1e677bb9f38a3151f120f4d7b51b53990ae18aad3421dcf677122f6fd2df
94 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to a known malicious infrastructure. The document body text and embedded URL suggest a lure for downloading an application, likely malicious. The ML classifier also flagged this PDF with high confidence.

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.cc/wix?keyword=valiant+hearts+apk+1.+0.+4
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6383/5814/files/bafifelesukosovutozokave.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/99088121717.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/firidekezenep.pdf
    • https://static.usrfiles.com/ugd/66f7a0_4ff37a33c0dc49f2bfe53bfb6c0561b7.pdf
    • https://static.usrfiles.com/ugd/805d2a_3455d15186744665945fa83460461540.pdf
    • https://static.usrfiles.com/ugd/3283b0_1ee4ad3270994e4c8bda84d401f26436.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/lewozavat.pdf
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/brunnstrom_s_clinical_kinesiology_free.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_off000054c0.bin
dd361fc5809af4985b61cecaf542b736ce00ff5007b719a7b242c5c65e2dd81f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C0 5248 bytes
font_01_sfnt_off0000669f.bin
51f44efdb948dac9e0a981911a968ac5513bf8879c8d46c9a6b15ffc91379bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669F 10592 bytes

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