Malicious PDF — malware analysis report

Static analysis result for SHA-256 e645be839f1e4bf7…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 15:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1d430ca2631836b97970e724e12d94f SHA-1: cfa697e155385bcfd37f7a0e547d12da8062184f SHA-256: e645be839f1e4bf7528bb5a1f81f59536d012fe485eeb81e265a3f89ccaf410b
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the same URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. The presence of numerous Shopify-hosted PDF links indicates a link farm SEO strategy to obscure the malicious redirector.

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.com/pify?keyword=caderno+de+caligrafia+para+imprimir+com+letras+pontilhadas+pdf
    • http://files.colindecio.com/uploads/1/3/0/7/130775001/363155.pdf
    • http://files.paqu.org/uploads/1/3/1/8/131871894/vibofukupu_ruzererijolibij.pdf
    • http://files.grahamlloydmusic.com/uploads/1/3/1/6/131637385/bemer.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/xofizumefomugem.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/raider_of_the_treasure_trove_poem.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/xozodegerigarugexuzowo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/27721646427.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0729/files/sesajupubibukotazos.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/application_of_nanotechnology_in_food_packaging.pdf
    • https://cdn.shopify.com/s/files/1/0440/2351/3238/files/danemuzulukita.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/pixotatogofu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4379/9719/files/ic_cd4060_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0134/files/vipexopifosakerijigotitit.pdf
    • https://cdn.shopify.com/s/files/1/0439/7652/3934/files/duzomipebujob.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_off0000606f.bin
abcaed6094c7c83e1ac961e7bef2abc6bef2d0976735d17c19b41b6f421f6a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606F 5476 bytes
font_01_sfnt_off000072e1.bin
cb538d41f77c28cdd26e3ba9b29363900a704278b8e02497b89eb1f22f912d45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E1 11676 bytes

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