Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1a8b42dd45fd0b…

MALICIOUS

PDF

50.5 KB Created: 2020-08-14 00:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc65d1036075a291450ea8fd74bc875d SHA-1: 36da870a9d398448c5dc6242778cdc807631056b SHA-256: be1a8b42dd45fd0b997ab8b92487d4a75bf70ea0698a384aa3710c340b2e2b24
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.com/pify?keyword=barcelona+fixtures+2019+pdf'. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly supports the malicious nature of this PDF.

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=barcelona+fixtures+2019+pdf
    • http://files.misshortonsclass.com/uploads/1/3/0/7/130775432/juvelu.pdf
    • http://vipaweda.themydlarzlab.com/uploads/1/3/1/8/131856713/49a8ce20ae20a.pdf
    • http://files.nycea.org/uploads/1/3/1/4/131407148/sitozulokarirugas.pdf
    • http://files.camdencollaborative.com/uploads/1/3/1/4/131482916/pazejono-toxelogazukoku.pdf
    • http://files.agapeholisticaromatherapy.com/uploads/1/3/1/4/131437930/tizutujem.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/lajimon.pdf
    • https://cdn.shopify.com/s/files/1/0440/4789/2630/files/bhagavad_gita_file_in_gujarati_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/cause_and_effect_worksheets_7th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/pogifase.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/kcse_agriculture_project_beans_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/29633238554.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/32181819495.pdf
    • https://cdn.shopify.com/s/files/1/0454/7844/5206/files/succeed_in_cambridge_fce_10_practice_tests.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/etat_de_rapprochement_bancaire_excel.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8138/files/mean_median_mode_grouped_data_example.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9208/files/97398801431.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0328/files/sazewerijixasokig.pdf
    • https://cdn.shopify.com/s/files/1/0437/2643/8550/files/18369315029.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
stream_005_off0000a278.bin
237cbca99dd9fbf810ed50cdf545e8cd8740c7f424afedbc6f4af806923db669		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA278 17540 bytes
font_00_sfnt_off00006445.bin
2a31d3e5191c33bc1cb6041fff4d34321cdf50a39efceb4258165e779a884cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6445 5748 bytes
font_01_sfnt_off000077e5.bin
96635bbc02fa682f03cbeb6fd9d3b3f214225d31365b23187d165b294d9478c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E5 13676 bytes

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