Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac53e92a74e144e…

MALICIOUS

PDF

39.3 KB Created: 2020-08-05 03:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a11917928ad1b1c45e3309868aae2eb3 SHA-1: d928b7fecf2a11c0b729f1901ca3a3320708a7df SHA-256: aac53e92a74e144ef00be5cd08d5100ec880aba1bb91a9680a6ea0525db3d61e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.ru'. This URL is presented within the document body, disguised as a UPC barcode generator. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicates maliciousness.

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/pify?keyword=upc+barcode+generator+pdf
    • http://files.susanstollphotography.com/uploads/1/3/2/6/132680955/2864807.pdf
    • http://files.grahnforlang.com/uploads/1/3/1/0/131069992/69da357.pdf
    • http://files.psycholoog-gooi.net/uploads/1/3/0/7/130738719/suwerulotopu.pdf
    • http://files.top500albumreviews.com/uploads/1/3/0/7/130738562/3984093.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.pdf
    • https://cdn.shopify.com/s/files/1/0432/5277/7128/files/92767063768.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/72949456021.pdf
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/27251215331.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2430/files/manidweepa_varnana_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2132/8807/files/ribizupekizoxepibukemup.pdf
    • https://cdn.shopify.com/s/files/1/0429/9037/0975/files/damodaran_on_valuation_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/86549374165.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_off00005c85.bin
066059e34d8a246166d3e221273b41829c3b40daff858de9cc548677fab5fe3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C85 5244 bytes
font_01_sfnt_off00006e68.bin
ffffd529792f6bd3824a8a3c73fe29a3164f0f56b5918240463e7a55e249d6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E68 10004 bytes

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