Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea98841e6e5ddc0…

MALICIOUS

PDF

42.4 KB Created: 2020-08-11 06:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27c2b7f15806c11c70c3014d8fd86a2f SHA-1: 79e6c4583eb8844efad59c3859235154d888854d SHA-256: 9ea98841e6e5ddc099bb3d556104f319884ee68c76524aba0cb7d50b7222cd65
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a dominant host of cdn.shopify.com. One of the primary links directs to a known malicious redirector at 'ttraff.com', which is likely used to obscure the final malicious destination. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to deceive search engines or users.

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.com/pify?keyword=gallbladder+diet+pdf+spanish
    • http://files.srajohnsonspanish.com/uploads/1/3/0/7/130775306/nigogiwozi.pdf
    • http://files.anchorbeertogo.com/uploads/1/3/2/3/132302736/d6852a46b64b1.pdf
    • http://tudisubu.highplainsarena.com/uploads/1/3/1/6/131606349/nusixavofo_xinegi.pdf
    • http://files.foreverearthbound.net/uploads/1/3/1/8/131856125/3678040.pdf
    • https://cdn.shopify.com/s/files/1/0438/6547/3184/files/mysql_node_createclient.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/r._danny_bot.pdf
    • https://cdn.shopify.com/s/files/1/0440/3272/1046/files/comunicao_assertiva_no_trabalho.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/80473921509.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/zizuzigalaxawimuwurofok.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/wajagimiwor.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/66604794829.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/tutorial_android_studio_bahasa_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/jepamusuxikuzumafemezibi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/nanorokoza.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/39419207737.pdf
    • https://cdn.shopify.com/s/files/1/0438/3480/2333/files/bestiary_pathfinder.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/adjetivos_en_ingles_y_espaol_para_describir_personas.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_off000068b7.bin
b155075a34aacce5a64b285a4ca89078bd9af64bbcfaa4054c664f779f0a3f86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B7 5300 bytes
font_01_sfnt_off00007ab2.bin
babd785dda7784a85b2c96cf289f7d073970e3c0ef8545e189fa4dabc9c67baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB2 10028 bytes

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