Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfe9c2c3f52d6ec…

MALICIOUS

PDF

46.1 KB Created: 2020-08-30 15:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d72b9653f016e0c9cae97db2cd4e620d SHA-1: 469be27e7b0e1ee2e7b66a2f903b955f6a8303e9 SHA-256: cdfe9c2c3f52d6ecc68b5a7eecd88c607d5d15c105c9f3c059940fa86b94cf5d
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=direito+eleitoral+atualizado+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including 'https://cdn.shopify.com/s/files/1/0430/9683/4212/files/nagerolazegiwi.pdf'. The document body, though heavily obfuscated, contains text suggesting it is presented as an 'updated PDF' related to 'direito eleitoral', likely a lure to encourage clicks on the malicious link.

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.cc/wix?keyword=direito+eleitoral+atualizado+pdf
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/nagerolazegiwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0608/files/wii_u_common_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/ejercicios_de_operaciones_combinadas_para_primaria.pdf
    • https://static.usrfiles.com/ugd/3e87bf_c742ebc7599d4067b3ca37874d18ead6.pdf
    • https://static.usrfiles.com/ugd/b8c837_48d132b8992940a8b6dfd096f1126b78.pdf
    • https://static.usrfiles.com/ugd/d2751c_dd891bc64c84415a98cad2e8d8e30a87.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac000b7685f14196bf4bad74d22ef237.pdf
    • https://static.usrfiles.com/ugd/07625c_73d7ac64ee9f46b0b1165be7127193a7.pdf
    • https://cdn.shopify.com/s/files/1/0436/9448/9755/files/42627711660.pdf
    • https://cdn.shopify.com/s/files/1/0439/1596/8680/files/stay_hungry_stay_foolish_book_review_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/jimirarifelumodutivi.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_off00007303.bin
03acc33247c98f3d51c214819cfc50fa8da7e9c8824524ad5f4194a98ec664e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7303 4904 bytes
font_01_sfnt_off000083ca.bin
99f916a66b70a77ed01bfb33f8af58c76acf3832dad9202e60946487eb89c939
pdf-font-stream PDF embedded font (sfnt) at offset 0x83CA 12644 bytes