Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ab0c3c20f25cc9…

MALICIOUS

PDF

44.6 KB Created: 2020-08-29 02:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 896b66c7e75db7d7136ae7952d857bbb SHA-1: 24a54bc81c14c869e71d03ca08fd6dabf17b4ff4 SHA-256: 76ab0c3c20f25cc948376c968c3f11b2111c12fa6adbbe646245f41171eca9e5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to a known malicious redirector, which is further supported by the ML classifier's high confidence score. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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=dps+audit+number+on+temporary+license
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_0399333a34a74fe2886e000b8b12b952.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fe391e1ecc7423fbb588e96e9cb1cfc.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5adc04bb8e148e19018b756e5eab315.pdf
    • https://static.usrfiles.com/ugd/b8c837_a917695fcc12412e834d052dc22b206c.pdf
    • https://cdn.shopify.com/s/files/1/0430/9558/9013/files/75738729654.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/tezavoxagonis.pdf
    • https://static.usrfiles.com/ugd/b8c837_97f6b10ce3454c0db85ad522e47a3c50.pdf
    • https://static.usrfiles.com/ugd/b8c837_7963a5d28ff3418eb938050d1d49058c.pdf
    • https://static.usrfiles.com/ugd/b8c837_60b4d206c38c471dbc1e33b39cfaf50f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed426657fc0c469bba22da7019b26597.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea399ba4cd994279b0002bf92c8c1a7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_88cba62e2da04a3b9fda8a00b430dbeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_7561fce18c124605ba7d43927f70ad2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ef510d21cea40feb2e98415b686354f.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_off00006e90.bin
7999a261301ab10419e50c7b61c6db8a769dcbd5ec60aee9c9b6a0b597787d89
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E90 5460 bytes
font_01_sfnt_off00008101.bin
94a7aca4aa7568763fb75c91b7f7ed1adbe58643af60a0a4d0513e872b6f7d04
pdf-font-stream PDF embedded font (sfnt) at offset 0x8101 10624 bytes