Malicious PDF — malware analysis report

Static analysis result for SHA-256 66be9cf5e83a2ceb…

MALICIOUS

PDF

67.3 KB Created: 2020-08-16 02:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abf315822ee84870bd3bb289057a46f0 SHA-1: e1a1e229e1f725c1d165197dfe94b7a8d27bb36c SHA-256: 66be9cf5e83a2cebd9cfcca5cce794b0b365cd0aba2fa94478c318679e150432
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also features a large number of embedded links to external PDFs, suggesting a link farm or a method to distribute malicious content. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits.

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/wb?keyword=lemebel%20libros%20pdf
    • http://duxidi.nualahairdressing.com/uploads/1/3/1/4/131437601/wijoxulis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0433/2204/8667/files/speech_writing_format_cbse.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/acute_pulmonary_edema_nejm.pdf
    • https://cdn.shopify.com/s/files/1/0429/5059/0627/files/11847247851.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32773531818.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/kuripavabegulumosaxurifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1690/files/91509892097.pdf
    • https://cdn.shopify.com/s/files/1/0432/2682/4859/files/livro_boca_do_inferno_em.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_off0000c7f6.bin
a34c7a1e05e19be11aca933c9a5414fbc7ecf89a35e894a45c89e5a7832ef2a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 5060 bytes
font_01_sfnt_off0000d90d.bin
f78e2773e6710d889bf61aeb45300b412834ef9253bae79c191e9ba6634021bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 11680 bytes

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