Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb15c7aff7357e88…

MALICIOUS

PDF

42.1 KB Created: 2020-08-06 00:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27b99e0951acf51ec1533cc11b0cb4e2 SHA-1: 3441ece9bf6af2468288c2600a955b9b045b18da SHA-256: eb15c7aff7357e8830fd801b41bccbe7429041c062a7e1cdf0b0a0b0e32106d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=atletismo+pruebas+de+pista+pdf'. This indicates the document is designed to redirect users to malicious infrastructure. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=atletismo+pruebas+de+pista+pdf
    • http://files.indianagenbukai.com/uploads/1/3/2/6/132695734/2083140.pdf
    • http://files.blackstoneheadwaterscoalition.org/uploads/1/3/0/9/130969306/fe7114350aaa3.pdf
    • http://lokulapuf.luxurybybrezotours.com/uploads/1/3/0/7/130775162/9b628b75cd334a2.pdf
    • https://cdn.shopify.com/s/files/1/0432/7607/5164/files/12059171198.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/nupodelukibajarelibap.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/livro_completo_alcoro_em_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4132/files/nigasinuzegubokekuwujose.pdf
    • https://cdn.shopify.com/s/files/1/0433/9082/8700/files/basese.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/salelixakibikiziz.pdf
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/yardi_maintenance_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0431/5774/9917/files/zagav.pdf
    • https://cdn.shopify.com/s/files/1/0430/8071/2343/files/niweposewalodova.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/suzojobejiderozokewanow.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/kejafuxutib.pdf
    • https://cdn.shopify.com/s/files/1/0430/6436/1113/files/ketazoradajexagubi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/wuzerononowesazive.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_off00006620.bin
5b7ae2b2aa81e82f40e9fd0316f7c0cc410b665037ed1d35abacb41b36291f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6620 5316 bytes
font_01_sfnt_off00007812.bin
c1dadcc53097eb425065322e5ecde610b49ecde3841eb8121e73d61839302393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7812 11016 bytes

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