Malicious PDF — malware analysis report

Static analysis result for SHA-256 1661a057cf8ba7c2…

MALICIOUS

PDF

53.2 KB Created: 2020-08-19 13:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d47bfdcf2fdad58d1c31d41083d463d SHA-1: 49ce2db5d8764355ed2d3b16a533ed0b041762bd SHA-256: 1661a057cf8ba7c23896e2218fdf831a4e1f4a53c218b00c573ae9c37e1613cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, masquerading as a piano sheet music PDF, to a redirector URL that is known to host malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly. The primary IOC is the redirector URL, which is likely used to funnel victims to a malicious payload or phishing site.

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=guilty+crown+krone+piano+sheet+pdf
    • http://files.expandedhealing.com/uploads/1/3/0/7/130775762/mifiborerog.pdf
    • http://files.debbiemorrison.net/uploads/1/3/2/6/132681210/weluza_jipegenobexoriv.pdf
    • http://files.roseland-retreat.com/uploads/1/3/0/7/130776149/dozupiresitubim_sodudoje_venatejunolod_desigivam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3785448733.pdf
    • https://cdn.shopify.com/s/files/1/0434/0691/7799/files/markdown_image_size.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/87523888770.pdf
    • https://cdn.shopify.com/s/files/1/0435/6866/0643/files/mizubexiwap.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3898/files/vetipamagoludapo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/runolukowofebugavugawavik.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/tobenufumawugine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/22897150934.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/36833469546.pdf
    • https://cdn.shopify.com/s/files/1/0439/0774/3899/files/dajawumaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d6b.bin
f0c3aa0d7c1104efecf74bf161c157b3b3a640761423d0bd8850c93140c17f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6B 5216 bytes
font_01_sfnt_off00007f7e.bin
38257e84a6b59ba21b8a7b034db540dc7db932bacffd23f8d288ef6134bc32d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7E 5532 bytes
font_02_sfnt_off0000925a.bin
2bb4ccb45cdf4811882a5259e7946997e1a32ecb6899a97b2e551452bab657c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x925A 4112 bytes
font_03_sfnt_off0000a248.bin
beaf51de090e5fb3a1a639c4776e76cb78589fb7bd6c2cfbe59240eeaa9ae37d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA248 10684 bytes

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