Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c5d9f89c809f11…

MALICIOUS

PDF

55.0 KB Created: 2020-07-29 02:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54948e83282e0efc384ecb67d36b843b SHA-1: d7558b2a53e85b36b246f583f662bf44f2c877f3 SHA-256: e5c5d9f89c809f119607c6b2b10c28cfa4474303201de0460930528513c72f24
120 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to an 'earthworm anatomy worksheet key'. The primary IOC is the malicious redirector URL, which is likely used to deliver a secondary payload. The PDF structure and embedded links indicate a social engineering attempt to trick users into visiting a harmful site.

Heuristics 3

  • 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.
  • 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=earthworm+anatomy+worksheet+key
    • http://files.chrisrossarthur.com/uploads/1/3/1/4/131483019/tezejiwuxakosub_pogubekipo_pezagutowomo_japosapi.pdf
    • http://files.mizpah36.org/uploads/1/3/1/3/131379045/6624586.pdf
    • http://files.westtechmobile.com/uploads/1/3/0/8/130813778/tewowaju.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/52911990064.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/60338888593.pdf
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/mokixanobilopitunawana.pdf
    • https://cdn.shopify.com/s/files/1/0439/3179/5624/files/65722746280.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9079/files/vasegomapo.pdf
    • https://cdn.shopify.com/s/files/1/0439/7786/7422/files/10074484103.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2469/files/nifebenuvewer.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/67230592143.pdf
    • https://cdn.shopify.com/s/files/1/0433/3666/3208/files/pemukisalupakaxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/xobuwupedes.pdf
    • https://cdn.shopify.com/s/files/1/0434/5341/5576/files/86194325814.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/78947696854.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/
    • https://cdn.shopify.com/s/files/1/0428/6083/9079/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b3e.bin
f98819fba356c789ec16ca2a489fd78ec641d41b825ac296c921ddd3785b2b84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3E 4848 bytes
font_01_sfnt_off0000ab9f.bin
ccc01b09d04b4a584aa353ef3b84851d43938b29b287e73210809aee593e5a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB9F 10376 bytes

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