Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b32a5a09c5a28b…

MALICIOUS

PDF

39.7 KB Created: 2020-08-12 20:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3bee5718950fc0f545b4bcd19554064 SHA-1: fdd1722cc239b345ee9291bc6220b4589a7e393d SHA-256: 09b32a5a09c5a28b93da297d7c4ff51f8913942c655e43cb2aeeea255cf85948
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains references to URLs and appears to be part of a link farm strategy. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=ansys+apdl+user+manual+pdf
    • http://files.ndsportschannel.net/uploads/1/3/2/6/132681303/8bb736d63e2838.pdf
    • http://files.alaneisenstock.com/uploads/1/3/0/9/130969470/97c5671198234.pdf
    • http://files.clivechristianfellowship.org/uploads/1/3/1/0/131071114/830e9db63b9aa9.pdf
    • http://files.carolmears.com/uploads/1/3/1/8/131856907/e6b437ce5.pdf
    • http://files.lavenderbluevintagedesigns.com/uploads/1/3/0/7/130775537/kifeziditaduku-fepidesunulim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8315/9957/files/dozotubunuzus.pdf
    • https://cdn.shopify.com/s/files/1/0434/7622/2118/files/form_940_instructions_2015.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8913/files/lyrics_sharp_dressed_man.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2045/files/badegamev.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/airline_ticket_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/7563/3306/files/warehouse_manager_roles_and_responsibilities.pdf
    • https://cdn.shopify.com/s/files/1/0433/9236/8798/files/nibateratafejanirefug.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5965/files/99806158395.pdf
    • https://cdn.shopify.com/s/files/1/0428/1512/7708/files/ropux.pdf
    • https://cdn.shopify.com/s/files/1/0431/1996/8417/files/latex_figures_side_by_side.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051bc.bin
9877d2cf4c585fdf65cd5d2bff2e7aa2dee5a0e9fe9031d2840eb5b9b193d529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51BC 4920 bytes
font_01_sfnt_off00006257.bin
c3a86fb516e4ff798f89af39ca4b5015634dc39e935b0a28f4eba5c3d56496d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6257 9772 bytes
font_02_sfnt_off000083d4.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D4 4324 bytes

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