Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee1768b71e7ee3a…

MALICIOUS

PDF

45.4 KB Created: 2020-08-20 12:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53ce491cd22d8744e1d6d188cc982b47 SHA-1: dfba6b2d90a59415dabb20f234bf92ee496b2746 SHA-256: 6ee1768b71e7ee3a6af48e1f6128b2fb2288df82da68af060ff2f87ba9423908
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure impersonating a Google Drive notification, directing users to click a link. This link, 'https://ttraff.cc/pify?keyword=google+drive++limit+exceeded', is identified as a malicious redirector. The document also hosts a large number of external PDF links, many of which are benign, but one points to potentially malicious infrastructure. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=google+drive++limit+exceeded
    • http://fovefa.sarahtheeboom.com/uploads/1/3/0/7/130738721/wigukulemabipubome.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2230/9786/files/download_nitro_reader_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/the_discoverers_daniel_boorstin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0735/files/kinetezeduj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/jiwudoxemufip.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/riwixizovakusesub.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/asexual_vs_sexual_reproduction_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7745/9363/files/4570022175.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9713/files/inside_outside_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/flow_cytometry_and_cell_sorting.pdf
    • https://cdn.shopify.com/s/files/1/0433/7542/7740/files/pujisidodosidos.pdf
    • https://cdn.shopify.com/s/files/1/0437/3613/7882/files/android_developer_fundamentals_course_practical_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/orthographic_mapping.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_off0000656a.bin
70f76b1df5678c1fbf60b7a2e002df7e086b7fcc03d05a0e1c0dff14f3aaae0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656A 5032 bytes
font_01_sfnt_off0000767e.bin
ffcdda960d49058d74d6253345589df93ad0c3a32077b0bba2e841a8bdaaf11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x767E 18768 bytes

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