Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99777ce342b3f59…

MALICIOUS

PDF

43.5 KB Created: 2020-08-29 20:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4a473588d3eee176fc4bfb70741da68 SHA-1: 1dbe283d7e6adafc3db6c8a0c9dca116df82864d SHA-256: f99777ce342b3f5923cf08f83d9b0851cc9ea39fda7939d2c566d8c54d4e8be0
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. Additionally, it exhibits characteristics of an SEO link farm, with numerous links to Shopify-hosted PDFs, likely to manipulate search engine results. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily corrupted, contains the title 'Tecnicas participativas para la educacion popular ilustradas' and the malicious URL, reinforcing the lure.

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/wix?keyword=tecnicas+participativas+para+la+educacion+popular+ilustradas
    • https://cdn.shopify.com/s/files/1/0464/9022/2744/files/vupegiwo.pdf
    • https://cdn.shopify.com/s/files/1/0445/5497/7444/files/berelotujuzefozinifot.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4136/files/banodugitowomizevamumeju.pdf
    • https://cdn.shopify.com/s/files/1/0428/4825/6156/files/9640793414.pdf
    • https://cdn.shopify.com/s/files/1/0434/7052/0470/files/crculos_perfeitos_em_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1073/files/accounting_principles_11th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7913/files/fujofagukezemulafapa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3474/6790/files/4110731168.pdf
    • https://cdn.shopify.com/s/files/1/0437/2817/5255/files/97648683760.pdf
    • https://cdn.shopify.com/s/files/1/0452/5654/0317/files/tasmanian_tiger_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/jekemonulujifowixukarolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/af_form_4009.pdf
    • https://static.usrfiles.com/ugd/b8c837_b141bc19f86a429baf8c81e42b40d6e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_172efa5ee21f4ac49c4e42bfffa82872.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e4f0ebc1dc04cd281f6761e5a259a00.pdf
    • https://static.usrfiles.com/ugd/73cb9e_883b647e97384236ab01bd14c7301868.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_off000068cb.bin
e02874da0b4e43677fff73002457bda4fd3f71e2a42d2824b3ed8e76e790e468
pdf-font-stream PDF embedded font (sfnt) at offset 0x68CB 5076 bytes
font_01_sfnt_off00007a19.bin
1f17fd0873af848344224511f0027e9f16a955642189f274cf390158f078f132
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A19 11752 bytes