Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb62dc96472f86d…

MALICIOUS

PDF

67.8 KB Created: 2021-01-06 05:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ab3013756bb0fa1104eeda1134d58baa SHA-1: 9d0d406f8b447438b93b44f2a0490e7850a2795a SHA-256: 8cb62dc96472f86d770ad3356cf4520c1cf4e89b328b15ebb7f91f04cde0bc3b
94 Risk Score

Malware Insights

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

The PDF contains an embedded link to a known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The document body text is heavily obfuscated and appears to be corrupted, but the presence of the malicious URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/aws?utm_term=audio+song++punjabi+new In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_5fa52c1ca46e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_5fea15542d34f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490365/normal_5fdd36c1f2d39.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/dGviiog/67356329881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_5fbfe37a0237e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487935/normal_5fc18664106ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457881/normal_5fced3be78cfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5fdf52a7361f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f87853675dd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/beautifier_gospel_song.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/zemusumar.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/24277097942.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 5296 bytes
SHA-256: 7968c28e25c2090536d8bd5815aeec12e66e2ac362cbe855bc26579f3573cb88
font_01_sfnt_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 11136 bytes
SHA-256: 3dbf19d95cd5a387f7d24cee09ea9a056016ece5c0f0d2c4ee9c4b99755c5549