Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b357b2b65964719…

MALICIOUS

PDF

53.3 KB Created: 2020-08-01 19:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8ac0cafb1582a3440e22fdf95700959 SHA-1: ffe908bf96a696fb2530033111599d37ea946316 SHA-256: 5b357b2b65964719beebd24bad6ea8f8a420581639ecd22fad953fddc3d3196a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with the primary one identified as a malicious redirector. This suggests the document is designed to lead users to potentially harmful content, likely for phishing or malware distribution. 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.ru/pify?keyword=elastic+potential+energy+formula
    • http://files.melbournemindbodypsychology.com/uploads/1/3/2/7/132740172/lumubo.pdf
    • http://files.autorematch.com/uploads/1/3/1/8/131871864/2327721.pdf
    • http://files.nomomani.com/uploads/1/3/1/4/131437839/zigulu.pdf
    • http://files.accountinglyceum.com/uploads/1/3/0/8/130813364/dc243cc84a325f.pdf
    • http://files.schoolontherise.com/uploads/1/3/0/7/130774964/tibizava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/51835604607.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5205/files/14143372980.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/71798540639.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/notorious_2009_cast.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2138/files/vuzunulukewavuzusofutewod.pdf
    • https://cdn.shopify.com/s/files/1/0431/2363/8426/files/xojiv.pdf
    • https://cdn.shopify.com/s/files/1/0440/1712/3486/files/22252278346.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/11929606836.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/jigedo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/18404559597.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_off00007212.bin
98de843d1b0a50e5f56f012832b265cdad91768f066d7073492194ad1a337c6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7212 5396 bytes
font_01_sfnt_off00008469.bin
c1a2108811fe3001500eb01c9a195b942bd668a493dd57cbddbab2678b936958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8469 14964 bytes
font_02_sfnt_off0000b35c.bin
84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 16060 bytes

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