Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f4acfd5bef01f2…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 14:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89966ac1a1e564db02934c8c1d4e970c SHA-1: 1e565596c805d8930441fc3e27b25dd77af035e7 SHA-256: 72f4acfd5bef01f23c76c760070cd88495dc2378be047a18d035938f82af52a3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominently pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Bowers and wilkins formation range' and the URL 'https://ttraff.com/wix?keyword=bowers+and+wilkins+formation+range', suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=bowers+and+wilkins+formation+range
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_986b05e44234406e925ffbbe2a2f49c5.pdf
    • https://static.usrfiles.com/ugd/73f3b0_0173b96386244cbb975835df844b11be.pdf
    • https://static.usrfiles.com/ugd/09273f_f67bdf771cfa40d5904e16c75d257046.pdf
    • https://static.usrfiles.com/ugd/b8c837_16fed4493c3343ef977bce96d70c86e4.pdf
    • https://static.usrfiles.com/ugd/469aea_fc20d5898cb546af96a3676e493794ef.pdf
    • https://static.usrfiles.com/ugd/4ae4db_3e9def76e1e24ab5b11191eb34ea65d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_80af681399124cbe9b894ce3f21d82c8.pdf
    • https://static.usrfiles.com/ugd/bfbc46_5c75ef058a474859a834b5328cd99b57.pdf
    • https://static.usrfiles.com/ugd/b13fd1_1d8169fb2e4c47e69484c6b3e7aacd29.pdf
    • https://static.usrfiles.com/ugd/b8c837_a95941689db5425b9f4a0dd5103113fd.pdf
    • https://static.usrfiles.com/ugd/0baf77_c6e5571d5405433e9be008e031ac42f0.pdf
    • https://static.usrfiles.com/ugd/136d07_fb3f2038db224d0d94a0319c84777548.pdf
    • https://static.usrfiles.com/ugd/b8c837_426e891f1dd64b5bae7b05d0f50b8888.pdf
    • https://static.usrfiles.com/ugd/80bfa9_5e9240abe44b4386b2549443c3caeed0.pdf
    • https://static.usrfiles.com/ugd/b8c837_60f8c5c0c5174378b206cd19527f1baf.pdf
    • https://static.usrfiles.com/ugd/b8c837_6718665c2c244bb0a2cd4bbcf9101354.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_off0000683b.bin
3b7c491d89ed1be0cdd90f7d2242524ab48b02675d3a78d2bb38446a6707205d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683B 5432 bytes
font_01_sfnt_off00007ab5.bin
56de76fe79478fbee85c06632aaf3f39e15fbb84e2a2db6567b94ed2ea033e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB5 10560 bytes

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