Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6ae48e07a76610…

MALICIOUS

PDF

43.0 KB Created: 2020-09-09 03:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 735f61444e9de6c266182cd6dc256c28 SHA-1: b023ba4ef0fcec058b054e3a6c8358583d32ef93 SHA-256: 0f6ae48e07a76610d2dc395a20d180d3f3c1aaaa238d2d6da500c3cd4b2434e5
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'case report'. The presence of embedded URLs and the heuristic firing 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly indicate an attempt to redirect the user to malicious infrastructure. The ML classifier also flagged this PDF with high confidence.

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.me/wix?keyword=periodontal+abscess+case+report+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/0a593f_45e72472062848658b30abf1a107103d.pdf
    • https://static.usrfiles.com/ugd/943725_6e3619c6954842afb1c387b4ef3b7345.pdf
    • https://static.usrfiles.com/ugd/e42ee3_cd35b9324325459d9ff5ff054cf7f029.pdf
    • https://static.usrfiles.com/ugd/3801ff_1c7cba1a895e4c05b1f4404c001ca4c0.pdf
    • https://static.usrfiles.com/ugd/11b39a_be3aa9fdcc3b4dd0ba2a6bd1c30c6c15.pdf
    • https://static.usrfiles.com/ugd/87a178_71899a6aee8c4e24917805df9f73abef.pdf
    • https://static.usrfiles.com/ugd/0047a4_d6f3941b729c4a09999dae134cd613c3.pdf
    • https://static.usrfiles.com/ugd/822ecd_759d8737f66f42948562717ad9793aaf.pdf
    • https://static.usrfiles.com/ugd/a9e086_786963cbd72547929a201cb6ef500be4.pdf
    • https://static.usrfiles.com/ugd/6908d7_1f9ff48305494a2cbabd5333bf7faa73.pdf
    • https://static.usrfiles.com/ugd/b5472a_27a5f7b180e74c4984d827eac1811f3b.pdf
    • https://static.usrfiles.com/ugd/575fb0_6cfadc3456ff4fa9a50ba38574b45511.pdf
    • https://static.usrfiles.com/ugd/432b07_0673523714ea4386939c47fe5f6f257c.pdf
    • https://static.usrfiles.com/ugd/bc79a4_9ee99ec4371546c08da34eeae9c447a3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b22.bin
1c2dadaf1e7344b3752b0d50284f29cb83a3d8a8ff45b6bc647a8d5db2fcac36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B22 5076 bytes
font_01_sfnt_off00006c62.bin
1278238619bb7488c2d798a4dcf7edd8c90507986683b648f2d0691743181bef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C62 10208 bytes
font_02_sfnt_off00008f3e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3E 4324 bytes

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