Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3ab83d3ce01f27…

MALICIOUS

PDF

42.0 KB Created: 2020-10-02 13:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e846fae7bc952791a217a00991883b4 SHA-1: 1824d191ad47938808cf55a93e64444d8e19d306 SHA-256: 6b3ab83d3ce01f27d0ede608619a922b816753671dd2d741b2545ae6f88d8786
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or phishing campaign, aiming to direct users to malicious infrastructure.

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://ggtraff.ru/strik?keyword=sybil+flora+rheta+schreiber+pdf
    • http://vesel.fleenorfamilyadventure.com/uploads/1/3/1/4/131437299/5922759.pdf
    • http://files.mrhaughaboo.com/uploads/1/3/1/3/131383743/9477547.pdf
    • http://files.briandeon.com/uploads/1/3/0/8/130874416/vuzorif.pdf
    • http://merolo.camptesahe.com/uploads/1/3/2/6/132696067/b8b9c90.pdf
    • https://site-1039496.mozfiles.com/files/1039496/lokazefirajixuvoxuzanif.pdf
    • https://site-1038506.mozfiles.com/files/1038506/senazepigelapevijufuti.pdf
    • https://site-1036627.mozfiles.com/files/1036627/xepixusevo.pdf
    • https://site-1036902.mozfiles.com/files/1036902/dofubuli.pdf
    • http://files.gvscleaning.co.uk/uploads/1/3/2/6/132682737/tomimezewagov-gugixidiparogu.pdf
    • http://files.crengtech.com/uploads/1/3/0/7/130776055/suwalitamisot_ferunodos_fowixolag_warapimolazu.pdf
    • http://files.investwithsmdc.com/uploads/1/3/0/8/130873848/9758403.pdf
    • http://files.manygendersonevoice.org/uploads/1/3/1/4/131454305/1803793.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c81040f5-92ba-4e8b-82b7-c1d857de255e/xilepafalabuguxon.pdf
    • https://uploads.strikinglycdn.com/files/918ab684-8907-412c-8a57-c67e22cfa3b2/48602844857.pdf
    • https://uploads.strikinglycdn.com/files/019048cd-0619-4f8b-b557-4f190957710f/wafosalivuxavusilag.pdf
    • https://uploads.strikinglycdn.com/files/ec707b86-86c9-4251-98dc-0ed0d99dfc62/nebuzikuli.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_off000065e3.bin
f1b9e96c5e2ae3b25ca573d305bc1fffeebf9dc65672f2720623e9ff4067346c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E3 5588 bytes
font_01_sfnt_off000078de.bin
4ae5e393a10ec05f4bc0f6d9882f872ec32f287dc29e20a63eb768d76ea942a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DE 10008 bytes

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