Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6f40dec4b0f2fd…

MALICIOUS

PDF

64.7 KB Created: 2020-08-09 00:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1f329d52c435417e6ce2070545a7e1 SHA-1: 3df717c00681f7f7b81af669527a1259c7790bba SHA-256: 0a6f40dec4b0f2fd760907ff76a3495e36e7a7e84503679a55ce57ec692a2d1a
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains a URL that matches the suspicious redirector, suggesting the document's primary purpose is to facilitate this redirection. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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=miocardiopatia+dilatada+pdf
    • http://files.realty33nj.com/uploads/1/3/0/7/130775116/18d5fc8e8dbe8d9.pdf
    • http://files.authorkimfox.com/uploads/1/3/1/3/131379612/kemunafejebos_furugamoros_vagububike_wivosoruda.pdf
    • http://files.pacificcountycovid19.com/uploads/1/3/1/8/131871583/5438642.pdf
    • http://topevivi.crowningtouchnails.com/uploads/1/3/1/4/131407089/1737881.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/cable_stayed_bridge_construction.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52135332303.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/paviwodimezokeludulidi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3513/0018/files/algebra_worksheets_year_7.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35679391278.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1964/files/ielts_academic_word_list_synonyms.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4871/files/54028170052.pdf
    • https://cdn.shopify.com/s/files/1/0439/8075/1006/files/navy_blue_jacket_manual_25th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/vukazis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/tomupunoxidelajetixeba.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5712/files/capital_city_of_all_countries.pdf
    • https://cdn.shopify.com/s/files/1/0437/4609/9349/files/factorizar_trinomio_cuadrado_perfecto.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a91d.bin
ad5e3d299a8972d587bc0a9d4bd74dc5d48d58b381a215ce17fa826edb40ae61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA91D 4976 bytes
font_01_sfnt_off0000ba29.bin
94ea5f4fe973257c3c0ae5c340d5cd8f3687532ec8af6f04f98371260fdcf343		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 11028 bytes
font_02_sfnt_off0000dfd5.bin
2ac62f6fd0cf432b1a426a4050734915edae892539fbf82e39b32ad9df43bc89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 16304 bytes

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