Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be256af844f7dd0…

MALICIOUS

PDF

34.1 KB Created: 2020-08-25 16:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5623873f43a7e0f400c89b8f01a70fd SHA-1: 2e426dba5fe3484acb792bea3b4aa9cb8f977d10 SHA-256: 4be256af844f7dd0def619f4e5eb89e812aabc78e65899d68a3254e1584065e6
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a known malicious redirector, 'ttraff.ru', which is likely used to obscure the final destination. The presence of numerous links, many pointing to Shopify domains but with obfuscated filenames, suggests a broad attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=billian+billian+song++mp4
    • http://joton.olgabaptist.org/uploads/1/3/0/7/130775565/xekanotudabefinapesu.pdf
    • http://files.feehanonlinestore.com/uploads/1/3/0/8/130814926/vepezovubuwuwom.pdf
    • http://xatid.marquettemissionary.org/uploads/1/3/1/4/131452976/lozisud.pdf
    • http://files.stevenparrphotography.com/uploads/1/3/0/8/130815303/7055983.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/gramatica_portuguesa_brasil.pdf
    • https://cdn.shopify.com/s/files/1/0430/6360/7445/files/xegegabewabusejakojisefur.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4049/files/google_chrome_latest_version_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/metformin_hcl_xr_500mg_side_effects.pdf
    • https://cdn.shopify.com/s/files/1/0435/3464/7445/files/psicologia_aplicada_a_administrao_de_empresas.pdf
    • https://cdn.shopify.com/s/files/1/0436/0303/4276/files/mugijetavigizelanelekim.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/gulefukevekogexitom.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/zener_diode_circuit_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/14996877014.pdf
    • https://cdn.shopify.com/s/files/1/0439/7491/8302/files/94367391251.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_off000047a7.bin
acfca79fe4b0cb4eab290551f42fb7c2a5b11da90edff55a96a1b6ef2417154a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47A7 5320 bytes
font_01_sfnt_off000059ad.bin
ae32f929cc8c70ea7abf8dcab5e16eaa085be87e23f31476b8f923d7e47a4736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59AD 10252 bytes

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