Malicious PDF — malware analysis report

Static analysis result for SHA-256 de623bc75ca027ec…

MALICIOUS

PDF

48.6 KB Created: 2020-09-12 20:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 141d9bedccbc251b0c405a301c7eeb8e SHA-1: cb2d0a5a1ea594d29f70c9e641fd7e67ccbfce01 SHA-256: de623bc75ca027eca04bee3489d6de569e73b40de78a81a3060e8e95f9d2dd6c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a link farm designed to attract traffic. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this file. No scripts were extracted, and the document body is heavily obfuscated, but the presence of malicious links is sufficient evidence.

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.link/wix?keyword=el+arbol+de+guamuchil
    • http://files.rosielonsdalephotography.co.uk/uploads/1/3/1/4/131406149/fidisigipebazas.pdf
    • http://files.joelnadlerphd.com/uploads/1/3/1/4/131453698/bexapo.pdf
    • http://files.lindysteeleartist.com/uploads/1/3/1/6/131606198/68ddb27.pdf
    • http://files.bbluntsheabutter.shop/uploads/1/3/1/3/131383018/bajof.pdf
    • http://lexip.peomna.org/uploads/1/3/1/1/131164250/2133172.pdf
    • http://dowusurad.desert-rose-productions.com/uploads/1/3/1/4/131410685/fidebajido.pdf
    • https://static.usrfiles.com/ugd/221f3a_c8fe02638da64b8bb5f4952b84f86d47.pdf
    • https://static.usrfiles.com/ugd/89363e_6c3640ad5b9e4448917ade98bfc9db6f.pdf
    • https://static.usrfiles.com/ugd/0f1814_dde7a0536eb84325b33217c1b7912ef8.pdf
    • https://static.usrfiles.com/ugd/dad7b5_f3b240aa05cd472b8792c75da18c6748.pdf
    • https://static.usrfiles.com/ugd/f84671_6d977d6d417e4cc48f7f6b36e9f16dba.pdf
    • https://cdn.shopify.com/s/files/1/0431/1420/1250/files/behavioral_interview_questions_and_answers_nz.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4690/files/the_administration_of_justice_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0439/3094/3643/files/laxakepewanawiwes.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c41.bin
52c8c8569bf17c68d87f2e59c14a35ff214bf3b6b0d578a9f51016b18802cdef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C41 5272 bytes
font_01_sfnt_off00007df9.bin
a18a7155cf75891e0c6ed7cb3f256396093749334cd1e9a63e8d15b87290323f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF9 6824 bytes
font_02_sfnt_off00008ffe.bin
fdd454c89fc75f22e5419311aedd98fef78b65e45e307b1ba611574a3f4d970f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFE 10872 bytes

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