Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a14776d81a3ca5b…

MALICIOUS

PDF

41.1 KB Created: 2020-08-27 15:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32887b6c97aab899b292dad0c4667b13 SHA-1: 056624595d0e4bf0955808dfbc03eda42c36f4e7 SHA-256: 4a14776d81a3ca5b2d6041bc25c611e04521ac1103c0f30c7aa126c9a331eccc
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=descargar+psiphon+pro+exe', suggesting a lure for software download. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to various external resources, many hosted on Shopify. 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=descargar+psiphon+pro+exe
    • http://files.childcaredevgroup.ca/uploads/1/3/1/8/131871984/8842145.pdf
    • http://nurizarod.columbapoetry.com/uploads/1/3/2/3/132303382/7155232.pdf
    • http://zazoteril.lamsgolflinks.com/uploads/1/3/1/4/131407995/a78d36e902.pdf
    • http://lubegov.alisonhendleyhealing.com/uploads/1/3/1/4/131453096/2533637.pdf
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/aptitude_topics_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0437/6431/8359/files/supemuzox.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2829/files/95809062799.pdf
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/luis_de_camoes_lusiadas.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/calendario_oficial_sep_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/beginner_french_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/wpf_binding_string_format_concat.pdf
    • https://cdn.shopify.com/s/files/1/0431/1662/6081/files/tratamento_candidiase_de_repetio.pdf
    • https://cdn.shopify.com/s/files/1/0432/6260/7520/files/zafabobudop.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/polaris_pool_cleaner_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6229/5714/files/balance_sheet_format_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9927/3896/files/celestial_bodies_jokha.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_off000060d3.bin
141ae951c16b28a975d7ed88c95c69204224553cb1739f2fda64719c292a4705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D3 5232 bytes
font_01_sfnt_off000072a1.bin
b7e576c6266b339d248fb90c4f70ce57fa2b36bca02012e73895d7c324d6c525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A1 11060 bytes

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