Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8b33a698c4e0fd…

MALICIOUS

PDF

43.8 KB Created: 2020-08-11 06:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 671d99585230e69dd9be9f09830a5d98 SHA-1: efba51703e01e5f01ce6226fcdfd50c9608183db SHA-256: 1f8b33a698c4e0fded9c1d082e3aefa0eaa3244c0213d87d9c5e78926cf6c7eb
120 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious content, specifically disguised as exam preparation materials. The primary malicious URL identified is https://ttraff.com/pify?keyword=quantitative+aptitude+questions+with+answers+pdf+for+bank+exams, which is part of a known redirector infrastructure. The document body and embedded links suggest a social engineering attempt to trick users into clicking the link.

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=quantitative+aptitude+questions+with+answers+pdf+for+bank+exams
    • http://nilikaja.agelessfitsb.com/uploads/1/3/0/8/130874330/bazop.pdf
    • http://files.wongyuhao.com/uploads/1/3/0/8/130815213/paginozu_zipem_wesavuguvine_lenusi.pdf
    • http://nikuwi.larrysecor.com/uploads/1/3/1/4/131483138/bixisisikejezibofuzu.pdf
    • http://files.davidmichaeldesigns.com/uploads/1/3/1/6/131636825/ea940.pdf
    • http://ninoru.desertdairy.com/uploads/1/3/0/8/130873851/db3f5bfec82a2.pdf
    • https://cdn.shopify.com/s/files/1/0431/8940/3810/files/89810099111.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/34876182030.pdf
    • https://cdn.shopify.com/s/files/1/0436/5913/3081/files/momiwamebodaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6697/3598/files/97183749494.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4870/files/legimo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0711/files/winzip_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/6227/1898/files/bokozofuloro.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/jexekop.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/xonul.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/5035748214.pdf
    • https://cdn.shopify.com/s/files/1/0440/5044/8549/files/sql_server_concatenate.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_off0000600c.bin
26d9adbb4f9a730ec4c76e7b9fdc1719883a09efc81548fc314252776883e913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600C 5860 bytes
font_01_sfnt_off000073e1.bin
3bb8139dcbabd864aa7c78cbb7d6aa02efc08cefe73c548426e59592097d47ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E1 14536 bytes

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