Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e06dcd0ac2e8a4f…

MALICIOUS

PDF

41.1 KB Created: 2020-07-21 09:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1d17f10e3a679fdf0ec5d4b4a360955 SHA-1: f54c72f7eb3fe1ee8feb20c7e40b9160d7cb9186 SHA-256: 5e06dcd0ac2e8a4fdd57fbc65fc5c4d0ad29ee96ac2cc9c5a40be3a16b64504f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=igcse%20chemistry%20particulate%20nature%20of%20matter%20worksheet'. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate a malicious intent to redirect users to potentially harmful sites.

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/wb?keyword=igcse%20chemistry%20particulate%20nature%20of%20matter%20worksheet
    • http://files.ucfootball.co.nz/uploads/1/3/0/7/130775776/757eb.pdf
    • http://files.tiloscleanwater.com/uploads/1/3/1/4/131437636/lewovoxijinewatas.pdf
    • http://files.suviperformance.com/uploads/1/3/0/7/130775373/7497118.pdf
    • http://files.uicany.org/uploads/1/3/1/4/131437865/0d138a85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/76021805482.pdf
    • https://cdn.shopify.com/s/files/1/0428/7840/2723/files/87882930575.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/18655397162.pdf
    • https://davonux.files.wordpress.com/2020/07/kegarurudoke.pdf
    • https://samiligozit.files.wordpress.com/2020/07/29132671654.pdf
    • https://kofaseni.files.wordpress.com/2020/07/61788010808.pdf
    • https://lifizujow.files.wordpress.com/2020/07/85015091352.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/zaxefibejov.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/9321874265.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/rakegapoburijejatixafud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99237037604.pdf
    • https://cdn.shopify.com/s/files/1/0428/8361/2831/files/tugavezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5032/7451/files/6459478214.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/jusari.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_off00006188.bin
646349419c8187dc7a9289182cf6bee90629c77bd1c13eecd00b0eee15778dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6188 5508 bytes
font_01_sfnt_off00007437.bin
f47bc9a1b5f1ea3010674fc351be45ef69d7060b3e9834304b7780bcbf15d177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7437 10076 bytes

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