Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf7ec75135c51a1…

MALICIOUS

PDF

41.7 KB Created: 2020-09-05 18:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 500781f50f203f6573dea3acb9d6e057 SHA-1: cd9555348524e17ebed64aa2ee269eb6ef572c6e SHA-256: 5bf7ec75135c51a148865abb445af99958181f408f261cac1520f19739ab8c31
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains a malicious redirector link and a large number of external PDF links, masquerading as a download lure for 'Opera mini web browser apk4fun'. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's intent is to trick the user into installing a browser extension or update. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.me/wix?keyword=opera+mini+web+browser+apk4fun
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/35e1ce_ce76c5707b5c4ae48e8ae4e53ed4689c.pdf
    • https://static.usrfiles.com/ugd/6166c9_6225b85b5a2b4e249ce6f5b49bbf1581.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5ce2959be1140ceb0e46b680de0cc8e.pdf
    • https://static.usrfiles.com/ugd/b16523_ca1492008f4e4be0a32a4a6c77b0218e.pdf
    • https://static.usrfiles.com/ugd/54fa57_80f9effdbf6a470fbd84be122f1ee269.pdf
    • https://static.usrfiles.com/ugd/e1d12c_eb784b50617d472cb576f4fe41e060e0.pdf
    • https://static.usrfiles.com/ugd/7c41c1_f4d135578cc8431aaec3d484fc8417cf.pdf
    • https://static.usrfiles.com/ugd/01d500_4f04ed56a0984d9bbc5231754321435c.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/17084319159.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/kexiboxatufodofawasukaveg.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/68588335408.pdf
    • https://static.usrfiles.com/ugd/ed2d23_c5bf088d3acc425ca684e6f178367c30.pdf
    • https://static.usrfiles.com/ugd/38bf1f_983e661ae6404ea7bab4bac7d37d639b.pdf
    • https://static.usrfiles.com/ugd/b8c837_31ab62e2ed9c4746bce29bbd0a9a6965.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_off0000649a.bin
b56c69c1a0164e1d2815104389f747b760eec0c1e0a1bbda0d73b3c2826a39b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649A 5428 bytes
font_01_sfnt_off0000770c.bin
ebc787c2d4cd3956b7d2147ab0dd0984a8997762745a8ba12661ce987d0d2b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770C 10208 bytes

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