Malicious PDF — malware analysis report

Static analysis result for SHA-256 72826ccf0047cdc6…

MALICIOUS

PDF

43.1 KB Created: 2020-08-29 12:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab85ea1284d7aad94d0e58b4e89c7717 SHA-1: 72d08339748b90bbff38cad5248b79e812686962 SHA-256: 72826ccf0047cdc6cc1a1273d3413d1c9b7879a8b277ef9d04b33b03f8dc717b
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a primary malicious redirector URL, suggesting an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains keywords related to downloading a calendar, which is a common lure. The presence of numerous embedded URLs and the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.ru/wix?keyword=descargar+calendario+escolar+2019+chaco+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d070fc9f6bbe473f82c5944130ae5854.pdf
    • https://static.usrfiles.com/ugd/b8c837_d27bbf9491574b5898e8bbb83997746b.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcf8782af44b4518881e0c9c9d18b526.pdf
    • https://static.usrfiles.com/ugd/b8c837_69fedcdc486e465ea37485c580571494.pdf
    • https://static.usrfiles.com/ugd/b8c837_58c5dc89520f4dbfbbdb42a4cf89cece.pdf
    • https://cdn.shopify.com/s/files/1/0433/4714/8950/files/animal_cell_culture_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5888/files/after_effects_bounce_expression.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7570/files/puzoletur.pdf
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/types_of_economic_systems_chart_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4383/files/45513283101.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4314/files/92646838630.pdf
    • https://static.usrfiles.com/ugd/b8c837_31b8e2dd4a2a435da3a611e0c7ea2e79.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bf7263bb05a4677a9a3ee81b261f641.pdf
    • https://static.usrfiles.com/ugd/b8c837_6842c2b36a42404caf4783df198271e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_82286ee8293442c8a336b04116693c48.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_off000064e5.bin
e7b837c65919233a43daea3619ce6cc73e0eb1137fc285ebe260a2653473830f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E5 5900 bytes
font_01_sfnt_off000078f0.bin
9e153a0c78765fcdf7b2f290375c1c6429fde678556d264a8b317955e8ecdf8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F0 11368 bytes

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