Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf9182c87bacc21…

MALICIOUS

PDF

41.1 KB Created: 2020-08-09 18:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a74da7e714966903015276d9e162977 SHA-1: a1dcbda9bc1d28c9b34f8623359b372c23238ee3 SHA-256: ebf9182c87bacc217742b8f0dff752eede6a1780683cc75088f62bb6537f2924
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=auditoria+administrativa+franklin+fincowsky+pdf', which is flagged as malicious. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute malicious content. 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=auditoria+administrativa+franklin+fincowsky+pdf
    • http://files.jocampbellnz.com/uploads/1/3/2/6/132695339/628186.pdf
    • http://files.servastaiwan.org/uploads/1/3/1/4/131437147/a67519158f3b36e.pdf
    • http://files.adamwilliamchalmers.com/uploads/1/3/1/4/131453645/zerodukegokide_zisif_xibusuroxolalov.pdf
    • http://files.stkildasurflifesaving.org/uploads/1/3/2/7/132740204/8204888.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/parliamentary_system_of_government.pdf
    • https://cdn.shopify.com/s/files/1/0437/6903/6962/files/jawuleder.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8073/files/jesinaramiwaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/mupedo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3852/3047/files/xukirijubugikabogi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6376/9243/files/poveguganolizoruwa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0597/files/15741532505.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/65456220267.pdf
    • https://cdn.shopify.com/s/files/1/0439/2298/1032/files/tofiturudakavimape.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/scantron_answer_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/ledaboloviwoje.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_off000053ea.bin
b420c80e61eb193f6e640ddaac1f01195ed598f05d34f9f53718b6248080395b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53EA 5372 bytes
font_01_sfnt_off0000662b.bin
9885f1c187fb6437f3f65eec9f865cbb4dacb6bd1bc84c1d368408dd8dfcece3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662B 10284 bytes
font_02_sfnt_off00008911.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8911 4324 bytes

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