Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda3ac81193cecac…

MALICIOUS

PDF

39.7 KB Created: 2020-08-29 20:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b1a8e5a988255ede13b81157d5ddf17 SHA-1: 5a170255d402c6f5820d99797ab1f29c40866383 SHA-256: bda3ac81193cecace2faada8b891c61653bc0bf115d23d5339eb28bca24e00a3
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 a high density of embedded links. One critical heuristic firing indicates a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=ksp+stuck+on+loading+asset+bundle+definitions'. Another critical heuristic flagged the PDF as a link farm, containing numerous external links, with 'https://cdn.shopify.com/s/files/1/0438/0911/2226/files/gofapabeliwutipojarepa.pdf' being the first identified. The document body contains garbled text but includes the same URLs, reinforcing their presence and likely malicious intent.

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=ksp+stuck+on+loading+asset+bundle+definitions
    • https://cdn.shopify.com/s/files/1/0438/0911/2226/files/gofapabeliwutipojarepa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7595/3049/files/23831614985.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/typer_shark_deluxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/book_of_mormon_japanese.pdf
    • https://cdn.shopify.com/s/files/1/0440/5238/1846/files/30349741108.pdf
    • https://cdn.shopify.com/s/files/1/0432/0431/3247/files/numedilikinoze.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/69987107819.pdf
    • https://static.usrfiles.com/ugd/b8c837_40fac45572904770b6423b61e4f8c578.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ae7500b4a6e419fb4371d4f923e6e19.pdf
    • https://static.usrfiles.com/ugd/b8c837_16f9b168beec40f4aba744411290e806.pdf
    • https://cdn.shopify.com/s/files/1/0431/1157/9809/files/bright_futures_12_month.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/bird_box_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/86005380241.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_off00005ceb.bin
ab0dc207cead506971fb2796dae156e7c9847c717c10f02502118f1cdd3e288b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEB 5400 bytes
font_01_sfnt_off00006f5b.bin
07e74aee4db76033a951b5e0d04e1919e2ec2f56c6c7d458da435e9dcb42af89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5B 10188 bytes

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