Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b49c270d70bc293…

MALICIOUS

PDF

68.1 KB Created: 2020-11-18 21:31:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b6e70c46ebcd3dd1b638fa512a87b93 SHA-1: d0dd352d6506fa5f83f939e479ce501ded8d7e6a SHA-256: 4b49c270d70bc293a716abc838122c9582727fae3c534b2fe18f3a8c9a48454d
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as an 'Avast security pro license key', which is a common social engineering tactic to trick users into clicking malicious URLs. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms that the embedded URL, https://cctraff.ru/123?utm_term=avast+security+pro+license+key, leads to known malicious redirector infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=avast+security+pro+license+key
    • https://cdn-cms.f-static.net/uploads/4421462/normal_5f99ae680339c.pdf
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f9054781a751.pdf
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5fad36f95e4e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuraradaso/12505050928.pdf
    • https://s3.amazonaws.com/tojazudibumogab/amazon_echo_spot_user_guide.pdf
    • https://s3.amazonaws.com/mubefula/27130986799.pdf
    • https://s3.amazonaws.com/tugumeb/pse_decree_hd_ti_35_reviews.pdf
    • https://uploads.strikinglycdn.com/files/341cbb8f-506d-47a1-b519-c6e2c8da9bb3/41254126813.pdf
    • https://s3.amazonaws.com/tubupejevomo/9095000385.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_off0000ccd1.bin
5522604c072c4f09fb0dd6957ca324e3c860da91b2ca61f01fef20193a75df38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 5140 bytes
font_01_sfnt_off0000de6f.bin
8ccc30fa01744c6ac7c9a88e82b86882dcd7333fcfa7882cc9d98c17f14ffea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 10952 bytes

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