Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bf4043b5aee239…

MALICIOUS

PDF

58.4 KB Created: 2020-09-01 23:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc105d1acd1be901843dca25a876080a SHA-1: 7a6fe77a240fc4c1b42c28245d9159892260bd1d SHA-256: 16bf4043b5aee23928c13a11fa7457b776472c8630f7d4e2c9fb19b525bf1052
94 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'Bristol stool chart' and a URL that appears to be a lure. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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/pify?keyword=bristol+stool+chart+pdf+nhs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3b0c81_543e48e80f964c1d945e7e716ec0e4e6.pdf
    • https://static.usrfiles.com/ugd/e745be_c19665ede2a04de4bce4b2ec780f9282.pdf
    • https://static.usrfiles.com/ugd/7f16bd_5fd995e9fc564f14995328e67f7b080b.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_4829193e8ef94ecbae64805087b841a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e63ed30d3bb74fc4b721a7fc51224914.pdf
    • https://static.usrfiles.com/ugd/b8c837_642773ac15ce4b6585d5d3bfa5f34a20.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_641e29570eb04af78c1a435b5bd63c68.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7181/files/gujaxaxirezubawedozawuwu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/bruno_latour_reassembling_the_social.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ed8.bin
2093b7fc87c1d95f93ea29d548a01b6746536534214068bb6617aa3b61316c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED8 5292 bytes
font_01_sfnt_off0000a0d2.bin
f6fa0433ddaffd657273fd0cf2fc04193902cb1bf40740c79fb64bd516cd875b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0D2 12252 bytes
font_02_sfnt_off0000c7e6.bin
06d84a79787f49517cba9647d12dd77c675544b9e46e70dbd0c3ec2b8d2a160e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E6 16132 bytes

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