Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e51dc43e24ec5c7…

MALICIOUS

PDF

50.4 KB Created: 2020-09-01 00:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a78547673f0bff2452459ca906474cd SHA-1: 55290ed6b2207b9d37be3d0cc3aa385e79d77590 SHA-256: 7e51dc43e24ec5c76c30ba0814de9c897ce7e79674ac0c8634b4c7701a5cc5a5
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, including one pointing to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=meningitis+bacteriana+aguda+en+pediatria+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/99965f_86e5bd6c1e7141a7bb49cfe50115f05a.pdf
    • https://static.usrfiles.com/ugd/5899d5_cd540a1a97ae46a9a929e5df453cae6c.pdf
    • https://static.usrfiles.com/ugd/70c1f8_480266a8c57543018ec7d216c7ab8b0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_58416ba2f78a4895bab5a49beefad802.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_b20cdae46a0745ea93d4e4cb2576e87c.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/mukanevikagafoxefudit.pdf
    • https://cdn.shopify.com/s/files/1/0464/6495/8616/files/4569268926.pdf
    • https://cdn.shopify.com/s/files/1/0433/3859/6510/files/mysql_foreign_key.pdf
    • https://cdn.shopify.com/s/files/1/0434/4414/2245/files/78829019783.pdf
    • https://cdn.shopify.com/s/files/1/0433/6028/8927/files/7865994091.pdf
    • https://cdn.shopify.com/s/files/1/0436/0860/4829/files/hs_code_list_indonesia_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/attitudes_to_language_garrett.pdf
    • https://cdn.shopify.com/s/files/1/0464/6495/8616/files/11822292884.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/24130517091.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_off0000845b.bin
a6563da1163438fe6e6c2ebb6e58a6223b49a305cce72d7105cf5b671b7f79cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x845B 5436 bytes
font_01_sfnt_off000096f4.bin
24cd8887718e6c3a6459bdf2918871b3e4749726f87cca934826df14d5d025d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x96F4 10868 bytes