Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe362032ad4c255…

MALICIOUS

PDF

49.7 KB Created: 2020-08-31 06:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e82c0974110605052d17f1dc5f84fbf9 SHA-1: 59bfba54d592f9772bd214468eca5470902d9d56 SHA-256: bbe362032ad4c255e95ecffb21e0898fe7cac88ce85e4bdc9b592076aeb3137d
154 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, which is also present in the document body. This link, 'https://ttraff.ru/wix?keyword=i+quit+sugar+pdf', likely leads to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, suggesting a broader campaign to distribute malicious content or manipulate search engine results. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/wix?keyword=i+quit+sugar+pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/lowakomawe.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/zasedam.pdf
    • https://cdn.shopify.com/s/files/1/0434/4247/1064/files/93944825212.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/wekixiwikudumoxup.pdf
    • https://cdn.shopify.com/s/files/1/0433/5009/8078/files/97666709495.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/59961891621.pdf
    • https://static.usrfiles.com/ugd/55f640_5412a4c6dac6456894f4407a8d268958.pdf
    • https://static.usrfiles.com/ugd/3f4b99_d8b721a1916a48b6a9f611cd97239278.pdf
    • https://static.usrfiles.com/ugd/b8c837_60ba5be9e81e4bdf9057e0ef88e496fe.pdf
    • https://cdn.shopify.com/s/files/1/0435/9100/8419/files/rurofomukanev.pdf
    • https://cdn.shopify.com/s/files/1/0440/3416/2853/files/building_construction_file_download.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_off00008529.bin
7caff9a98b21c34840d02550eedfb470e8fe0a082a7630f55241a26f54c6aefe
pdf-font-stream PDF embedded font (sfnt) at offset 0x8529 5240 bytes
font_01_sfnt_off000096fb.bin
0b29a2509f5ef3810e46d495b2bb42a085ec6671c98ac44690d4078847699ecb
pdf-font-stream PDF embedded font (sfnt) at offset 0x96FB 10340 bytes