Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca89dc56c3ae5461…

MALICIOUS

PDF

61.0 KB Created: 2020-08-12 17:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35cae3f1d75cc233639309e59f00219f SHA-1: 02c567ec7492b63c7ed53439f4e90d35cc77c3e9 SHA-256: ca89dc56c3ae54610fb8b22c9407aec76d516213f660baf819278541b9c662e0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm for SEO manipulation or malicious redirection. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=rubella+disease+pdf', which is the primary indicator of malicious intent.

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=rubella+disease+pdf
    • http://guxekane.thebigbarmitzvah.com/uploads/1/3/0/7/130776760/jomejixuwuzow.pdf
    • http://jurugewo.sammybeaugard.com/uploads/1/3/1/3/131383483/tolape_gemapu_zazawulapasab_dodotifa.pdf
    • http://fekubogaw.unrestrainedshane.com/uploads/1/3/1/3/131384169/3312213.pdf
    • http://files.arlingtonreformedchurch.org/uploads/1/3/2/6/132696580/valivu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0629/files/putezeledusizowamosaxal.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/kufufawos.pdf
    • https://cdn.shopify.com/s/files/1/0439/1688/6184/files/31528078839.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/sixuxubaxusonoperare.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/71657231803.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/zeloxasifopa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/63248150075.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1042/files/xasizedarewosefosuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/tanorixax.pdf
    • https://cdn.shopify.com/s/files/1/0438/6455/5680/files/68499751891.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/61934601788.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/fisekovunovilezuwatetiku.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/nilafik.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/mijeduwirarebajarabon.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_off0000b1f9.bin
142e6a1efdb3c38676ced49d1731269495ea88c0db9cacae8a2462a8dca0d6c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F9 5084 bytes
font_01_sfnt_off0000c356.bin
a0bfd06f3bccfa4fcc785266e4bf97136909467bcf74686d9c1b5fc96f010071		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC356 10372 bytes

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