Malicious PDF — malware analysis report

Static analysis result for SHA-256 690c630207bf34bd…

MALICIOUS

PDF

40.8 KB Created: 2020-08-05 06:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 109028f4f554c848f48194d6a03caf63 SHA-1: 9536f00d84a9ce5d6fb68e086f5cc2514f2db327 SHA-256: 690c630207bf34bdbf31b2b1c9cce4b88c5846b283ffd004c18c541e239160f0
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, and is flagged by ML classifiers as malicious. The document body, though malformed, contains text related to 'pdf to word converter nitro pro' and a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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.com/pify?keyword=pdf+to+word+converter+nitro+pro
    • http://files.durhamcoc.com/uploads/1/3/1/4/131437683/nibelemozitaleg.pdf
    • http://files.thefeatherednestdowntownwestjefferson.com/uploads/1/3/1/3/131381693/zuredawonewetet_dukufim_xajefatoxibuga_wepiwov.pdf
    • http://files.gjohnstone.net/uploads/1/3/1/6/131637043/6103523.pdf
    • http://files.sylvainetlesfilles.com/uploads/1/3/2/7/132741241/gupaxafigurude.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9157/4430/files/kubapesu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1914/9216/files/81060365596.pdf
    • https://cdn.shopify.com/s/files/1/0440/8855/7718/files/oracle_jdk_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dipipopiluniwewikojidil.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/24969370273.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0439/4660/6760/files/javascript_vs_jquery.pdf
    • https://cdn.shopify.com/s/files/1/0436/2525/0974/files/how_to_upload_a_folder_to_github.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/abnormal_human_karyotype.pdf
    • https://cdn.shopify.com/s/files/1/0436/1807/4786/files/65261405310.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1085/files/gomomotulalajap.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_off000062dd.bin
43fed8c50f4ae8b8afc85ca208419775f5fc6356ad7be196d75f916ccc1d5b31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62DD 4880 bytes
font_01_sfnt_off000073a6.bin
8ca3d08073e0b2cef682949d9a383f52171625ed8149e72e28d7d31b3380c5ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A6 10260 bytes

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