Malicious PDF — malware analysis report

Static analysis result for SHA-256 829eacfe0e618f9f…

MALICIOUS

PDF

40.8 KB Created: 2020-08-31 06:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bcf7ef3abe161cce97201ee5327d34c SHA-1: 67272f83d74758746e55664f7c50433a08510857 SHA-256: 829eacfe0e618f9fa68306a4c996007e8a871d0983585c057c0b03c76b85bf20
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded links, a technique commonly used to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=present+progressive+worksheets+with'. Another heuristic flagged the document as a PDF link farm, containing numerous external links, with the first identified link being 'https://static.usrfiles.com/ugd/2f3ac6_ba210e72f26c4acab2d145099953fee5.pdf'. The document body itself contains garbled text and metadata related to PDF creation, but the primary malicious indicators are the embedded URLs.

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.cc/wix?keyword=present+progressive+worksheets+with
    • https://static.usrfiles.com/ugd/2f3ac6_ba210e72f26c4acab2d145099953fee5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b03a392f0c864f339b26f3c3b6d0a86f.pdf
    • https://static.usrfiles.com/ugd/704566_4ef6b7b17f29409ba0b845d134d9508a.pdf
    • https://cdn.shopify.com/s/files/1/0431/6905/4886/files/vamozizonidapidufim.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd6d9e42520c4d68b0dbe8b7a22bc707.pdf
    • https://static.usrfiles.com/ugd/f80014_32a08593be744da3ac08af1de7280874.pdf
    • https://static.usrfiles.com/ugd/99afdc_8bbd26e876964a6faa6855a9bb2a5110.pdf
    • https://static.usrfiles.com/ugd/23e9be_90a065ffb1564d7bb981ef7c1b75ee32.pdf
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/nutikowigafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/bluetooth_chat_app_android_github.pdf
    • https://cdn.shopify.com/s/files/1/0429/1202/2691/files/afasia_wernicke.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/52878919034.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/free_architecture_magazine.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_off00006196.bin
4e2c05fd974ee0d5e9605cd5d8829438687438b9e5d351bc33110b3188febee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6196 5056 bytes
font_01_sfnt_off000072e1.bin
60bf233efb8a7fd269fd0d92307036b9034e34cab15ec61d3abe65975cbfa618		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E1 10364 bytes

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