Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f2623a12be8758…

MALICIOUS

PDF

63.6 KB Created: 2020-09-02 01:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2632710c59b64fae3cbf70462d84fde5 SHA-1: be4be94ed4dba0368568ff31dddd143d3234fec2 SHA-256: a6f2623a12be8758901717afa01a81456fd4c65dc5314d8cb0bebf8e889fb02c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=fisiopatologia+de+la+hipertension+arterial+pdf+2017', is flagged as a malicious redirector. The document also exhibits characteristics of SEO poisoning, with numerous links to other PDFs, likely to manipulate search engine results. The ML classifier strongly indicates maliciousness, and the overall structure suggests an attempt to drive traffic to malicious infrastructure.

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.ru/wix?keyword=fisiopatologia+de+la+hipertension+arterial+pdf+2017 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6158/2741/files/panasonic_bread_machine_recipes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3464/6440/files/sickle_cell_anemia_punnett_square_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/3848/7206/files/ashrae_handbook_fundamentals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3706/4348/files/92194153401.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/apple_app_store_phishing_email_report.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/89064d_7483891802a14e019a4b5801e45a9bec.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3080/5669/files/kerekifufawigazidase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1811/7543/files/dempsters_hamburger_bun_nutrition_information.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8043/4342/files/37506439721.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/gw2_tequatl_timer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7195/3301/files/gewidunun.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/97aff7_3e1507443d8d4d728cca4ae47fa1fa46.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0dcf4b_b8b766d649d5407faa0e1cd4f4e0e115.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/217b8a_7a6d4e2eb12f43ed9ccf12691d7fc5ea.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4e6dd5_faf1d0c739c74900a0056d92b10ec781.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6D 5664 bytes
SHA-256: 6db469df7b3838542422c96adb87b4d547cdc653af95a009d83c616252539ba3
font_01_sfnt_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 10388 bytes
SHA-256: 25f7865bc46a0532e4342043090b82db8388c909071866e79b41f40231b97b71

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