Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bef4dfeb69fe35…

MALICIOUS

PDF

42.6 KB Created: 2020-09-01 15:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 730cadecd4e7943e7350c0962c1e1b55 SHA-1: 37833b858971a7c1c9f2e67419f9e009ae400433 SHA-256: 21bef4dfeb69fe35d0a1c6030d7b6d7abc2139782e5f76af2d19e7ecc906759b
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the redirect, suggesting a lure to a malicious site. The presence of numerous Shopify links indicates a link farm strategy to improve search engine ranking for malicious content.

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=green+day+good+riddance+song
    • https://cdn.shopify.com/s/files/1/0429/0412/5599/files/23904689512.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/nufopafo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/73rd_amendment_act.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/mugonulunubozukijukemake.pdf
    • https://cdn.shopify.com/s/files/1/0431/4637/9426/files/kakogomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2658/7549/files/28999205608.pdf
    • https://cdn.shopify.com/s/files/1/0449/4488/3880/files/angina_de_ludwig_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/72121857534.pdf
    • https://cdn.shopify.com/s/files/1/0437/5035/9194/files/22548881626.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/95135033947.pdf
    • https://cdn.shopify.com/s/files/1/0468/0876/0474/files/jarozuwebukiga.pdf
    • https://static.usrfiles.com/ugd/b914b5_c8ef139d15f94137b53bd95b68e4e8b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ed645975933482990576d0024d40b0c.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_off000068d2.bin
31d4edb5c4f0b2f45552ac61e41fe7e99f5daa43cbfc86436614244d7fe5d410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D2 5208 bytes
font_01_sfnt_off00007aa2.bin
a1ec0fb42de17750ec45811e01ae2c5a8a06de0db37aad165ff10e71b45a1226		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA2 10344 bytes

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