Malicious PDF — malware analysis report

Static analysis result for SHA-256 7276e2b8145f8b0c…

MALICIOUS

PDF

48.4 KB Created: 2020-08-31 16:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91fd07da0d8f258e46df9516c9b87d1b SHA-1: 3f076ef4cc797719cf7f0ceb3772ab7b07eda027 SHA-256: 7276e2b8145f8b0c60036834107c2b6fabc0b2d3eeced607986afae438347952
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'smart goal setting template for students' and the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML_NYX_PDF_MALICIOUS heuristic further confirms the malicious nature of the 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.club/pify?keyword=smart+goal+setting+template+for+students
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7600/1704/files/voretobejoxapodoxisefafur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7832/8224/files/crane_signal_chart.pdf
    • https://cdn.shopify.com/s/files/1/0435/1482/2808/files/delete_folder_github.pdf
    • https://cdn.shopify.com/s/files/1/0437/0599/1322/files/no_such_remote_origin.pdf
    • https://static.usrfiles.com/ugd/c7a620_9e636ae5d2e54b23b52762455825e020.pdf
    • https://static.usrfiles.com/ugd/6846fe_d8ca98909cde4ba3ada8cb04850b48dc.pdf
    • https://static.usrfiles.com/ugd/c836c3_443f5f9d261742d495d1731619a83d73.pdf
    • https://static.usrfiles.com/ugd/76b6de_63dca8a29f674c71b0ab870a8ad517d6.pdf
    • https://static.usrfiles.com/ugd/a18aa6_c9a46eecdf4c4f74a071207219b1a008.pdf
    • https://static.usrfiles.com/ugd/3aee12_9f458e4d776e46138e8cd61f023d9028.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_53f83ae2f69d4f64937492671012482e.pdf
    • https://static.usrfiles.com/ugd/2c608b_a7906d02d27247448fcad58430182dbd.pdf
    • https://cdn.shopify.com/s/files/1/0434/4633/7693/files/8x8_shed_plans.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3157/files/mufajegozavunuror.pdf
    • https://cdn.shopify.com/s/files/1/0432/3141/2379/files/99353682938.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f13.bin
1d4b423ba52535fef50f26e70737584c14e6a6be69cae08012b00e4e218cd704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F13 5464 bytes
font_01_sfnt_off0000918e.bin
e53e0bc9c413fd2bdb09744e1a3cc096984bab68bb6fdc9b4cc5de404f558e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x918E 10164 bytes

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