Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ac1d524e6eddab…

MALICIOUS

PDF

40.2 KB Created: 2020-10-12 15:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39e2ad2e70f2af4d66798bcd5d95b003 SHA-1: 32bf2a2fd5a95779524178d69a4a594ca2f290ef SHA-256: 30ac1d524e6eddabe0b61796393f3c0aebf0fa312b4e9c9182b395cc0867ed1e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a PDF redirector link pointing to gettraff.ru. Another critical heuristic identified a PDF link farm, indicating a large number of outbound links. The ML classifier also flagged the PDF as malicious. The document body, though obfuscated, contains the URL https://gettraff.ru/strik?keyword=nespresso+u+descaling+manual, suggesting a lure to a malicious site.

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://gettraff.ru/strik?keyword=nespresso+u+descaling+manual
    • http://zikojana.speckmath.net/uploads/1/3/1/4/131482952/wubuwoziwoxe-jabazivunopana.pdf
    • http://files.southlandcoins.net/uploads/1/3/2/6/132682882/7fbd45a.pdf
    • http://files.safetygradelicensure.org/uploads/1/3/1/3/131398455/7127695.pdf
    • http://files.foodiesoftheroundtable.com/uploads/1/3/0/7/130775182/970337.pdf
    • http://files.goodspeedwatches.com/uploads/1/3/2/6/132683136/f7be7f36f9.pdf
    • http://files.artisan-frames.com/uploads/1/3/0/9/130969938/jozuxebijabe.pdf
    • http://files.hcwellnesscenterandspa.com/uploads/1/3/1/4/131437834/fimal_rotinotuvoj_xodogukokaz_pipajarozibi.pdf
    • http://fedix.onestophistoryshop.com/uploads/1/3/0/9/130969408/mudemize.pdf
    • http://zuduvomew.transportchicago.org/uploads/1/3/2/7/132740482/6110306.pdf
    • http://files.meridianquinn.com/uploads/1/3/1/3/131380063/1399459.pdf
    • http://files.patriciacomb.com/uploads/1/3/1/4/131437983/4830173.pdf
    • http://files.sunharbourstudio.ca/uploads/1/3/0/7/130740211/ziwiwad.pdf
    • https://uploads.strikinglycdn.com/files/17c0077d-13c7-4a2d-b033-0bc782aaa3fb/dosabigematibigitijoretab.pdf
    • https://uploads.strikinglycdn.com/files/95281a00-9a8e-48fc-bd18-184c9e6506d7/34130550334.pdf
    • https://uploads.strikinglycdn.com/files/0a6c1353-7293-4bee-b144-ab05d8477f7e/30860274634.pdf
    • https://uploads.strikinglycdn.com/files/b0792c16-5c46-48c3-9af3-3a62cb8d2d5d/6920091750.pdf
    • https://uploads.strikinglycdn.com/files/6e0bebd8-fce0-40cf-8855-c2e65842abcf/watodixo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dae.bin
ed2761309692d314e56048c7359799e74d23206163930c1be93394b664a223b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAE 5360 bytes
font_01_sfnt_off00006fd1.bin
b9c0ec739019aff436253f642a2d16a14ae9eac51a6d285740df0037ac2c06d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD1 10732 bytes

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