Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f562bb690380a23…

MALICIOUS

PDF

37.0 KB Created: 2020-08-24 03:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1bbe73f86dc401de41a002c0559b65f SHA-1: 58600f49b31679bdd9824fd59a0dce996d14ddfd SHA-256: 9f562bb690380a2391d9b370a2c3a200a15393e8ed1f6e5c8486f0b2c4c40035
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a high number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=essence+of+earth+bdo+guide', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to trick the user into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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=essence+of+earth+bdo+guide
    • http://files.amazonmycorenewal.org/uploads/1/3/2/7/132712096/weverakevuw.pdf
    • http://files.madebyhollie.com/uploads/1/3/1/4/131406258/karagibex.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3338/files/apx_6000_detailed_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/sitekuzekamizitonepap.pdf
    • https://cdn.shopify.com/s/files/1/0438/2274/3709/files/kuat_medan_listrik.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4975/files/guzegedefosomizojoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/96996428609.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/50938204758.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/17173404215.pdf
    • https://cdn.shopify.com/s/files/1/0462/4475/7664/files/zuposokelota.pdf
    • https://cdn.shopify.com/s/files/1/0439/2153/9240/files/libros_de_arquitectura_de_software_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/13444938578.pdf
    • https://cdn.shopify.com/s/files/1/0429/7873/8335/files/lilevon.pdf
    • https://cdn.shopify.com/s/files/1/0439/1839/3499/files/25076559541.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/split_audio_from_video.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3511/files/partes_y_funciones_del_cerebro_humano.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_off000050af.bin
9e143913c9cabecead1876df2cfd6717a605d77fbb791eb2916fe87444472246
pdf-font-stream PDF embedded font (sfnt) at offset 0x50AF 5348 bytes
font_01_sfnt_off000062cf.bin
71452cf6618485a11d2e7dbd7c59217dc99e744c780b4d0913e2310e09a5f827
pdf-font-stream PDF embedded font (sfnt) at offset 0x62CF 10740 bytes