Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9392c25405a8e7…

MALICIOUS

PDF

41.3 KB Created: 2020-07-29 16:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 299410bd687af3147eabeb37f84efbaf SHA-1: 0d2b5e9999329090298cb6e43a9bcea34f618f0c SHA-256: 2e9392c25405a8e729a30a9b0d9274336b94f0a1ae272cfb66fa2f8ba1615bf5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily garbled, suggests a lure related to 'L encyclopédie du bois 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.cc/pify?keyword=l+encyclop%25C3%25A9die+du+bois+pdf
    • http://files.mastercreatorsadventureretreat.com/uploads/1/3/1/4/131406182/vupuro.pdf
    • http://files.daleresourcegroup.com/uploads/1/3/2/8/132814364/565759.pdf
    • http://files.viriyachot.com/uploads/1/3/1/4/131407977/lasolopurimutivijox.pdf
    • http://files.findyourcenterpasco.com/uploads/1/3/0/7/130738636/a1ed8.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/92864807605.pdf
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/26030172192.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/55445709883.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5770/files/86353224208.pdf
    • https://cdn.shopify.com/s/files/1/0430/8123/6634/files/domudugobakezafejiwoduwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/70625393363.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0431/7301/9808/files/12417578235.pdf
    • https://cdn.shopify.com/s/files/1/0433/7175/7718/files/menul.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5143/files/27294449724.pdf
    • https://cdn.shopify.com/s/files/1/0441/3535/0424/files/gapelimotomijipemum.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060f2.bin
634c777bc5883511dda0b6af30e36b9d86e37fd2fb0417c6c0515d9f30457b07
pdf-font-stream PDF embedded font (sfnt) at offset 0x60F2 4968 bytes
font_01_sfnt_off0000719b.bin
4fca82bee468383dcedb85fee79c5bbcd388a36a8e93d9cb3d30d4155f3dacb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x719B 11776 bytes