Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9800fcce372dd69…

MALICIOUS

PDF

115.2 KB Created: 2020-08-09 14:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18433ad5ac326309b10190351edd7123 SHA-1: 3ad60ee8a0dd7cd490a27c80abf8253cb84c100a SHA-256: c9800fcce372dd693484ab9a8fd53dfd70d488bd52b489c62aa362e92dd5b5ae
152 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.cc/pify?keyword=biosecurity+measures+in+pig+farms+pdf'. Additionally, it features a PDF link farm heuristic, indicating an attempt to generate traffic or distribute content through numerous external links. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent.

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.cc/pify?keyword=biosecurity+measures+in+pig+farms+pdf
    • http://jexolig.mysistersclosetthrift.com/uploads/1/3/1/6/131606186/6802112.pdf
    • http://nosomu.discountwiresupply.com/uploads/1/3/1/6/131606060/zufare-patek-norabir.pdf
    • http://pupozit.melissaritchie.com.au/uploads/1/3/1/1/131163635/xemexunedegijogi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8427/5100/files/que_son_las_bibliotecas_digitales.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/33302072398.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7452/files/50310747204.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7014/files/fraud_examination_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/transformations_on_coordinate_plane_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/7801/6406/files/leche_de_almendras_beneficios.pdf
    • https://cdn.shopify.com/s/files/1/0437/1775/5034/files/auto_indexing_gear_cutting_attachment_for_pneumatic_shaping_machine.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3510/files/7288996226.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/57633551430.pdf
    • https://cdn.shopify.com/s/files/1/0430/0839/3367/files/tumigepuvinesifuti.pdf
    • https://cdn.shopify.com/s/files/1/0432/7974/5192/files/bodozogulopa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/61464016578.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_off00018938.bin
256222bf5d783882150933e97b3e8daa775ba3a2b75c6e9b8bd8dc6377782238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18938 5596 bytes
font_01_sfnt_off00019c34.bin
6a9e6b2dd62f98e42bbca64643f7427cdfb404b8f5eeb12283e47848c97e456d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19C34 10364 bytes

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