Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca54916d8b41a3c8…

MALICIOUS

PDF

31.9 KB Created: 2020-11-05 17:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0423699f2df5be9c5b23b37e1573591b SHA-1: bd6409e169d71f986ad6af046d6e4c6def7ee433 SHA-256: ca54916d8b41a3c8aa8e9c41da80f0c05fa335669864fe57b36a772f65d124d5
94 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, indicating an attempt to lure the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firing suggest the document's primary purpose is to facilitate a malicious redirect.

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://gettraff.ru/aws?keyword=vocabulary+workshop+unit+13+answers+level+a
    • https://cdn-cms.f-static.net/uploads/4427295/normal_5f9b5c358a91a.pdf
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/tisonanoxurewubanupi.pdf
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f8765801c28c.pdf
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5f9ef419264d4.pdf
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f8882c6c725b.pdf
    • https://cdn-cms.f-static.net/uploads/4420013/normal_5f98dc6d92620.pdf
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f877d87a413a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rezugekolaba/bomisizutivebewu.pdf
    • https://s3.amazonaws.com/pazifetanegapu/54301140609.pdf
    • https://s3.amazonaws.com/zasepo/tiritolakililix.pdf
    • https://s3.amazonaws.com/pazovugal/fegalorinutifo.pdf
    • https://s3.amazonaws.com/xanebavifamopez/zebalovixikedajokeru.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_off000043b6.bin
26948e3600b6929322b8158ce42d80925973a2b3e3a627effde67707c3816abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43B6 5660 bytes
font_01_sfnt_off0000570f.bin
a7ca88186fbdf8620072876d109d1984cc917dddb06ef7fc9cd893ebe76d7914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x570F 8292 bytes

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