Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c539bfd6cca3bf5…

MALICIOUS

PDF

50.0 KB Created: 2020-08-31 07:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5199b87ee3da26bcd4b1cc76f610caec SHA-1: 7d6308581de388b05bfa6542d2effccac5cc27d1 SHA-256: 3c539bfd6cca3bf58ed48154cefaaf16d2d85c95646e5b6605227ae132ad3b4d
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary heuristic indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the document is designed to lead users to malicious content through a link farm.

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=perspectivas+sociologicas+peter+berger+resumen
    • https://static.usrfiles.com/ugd/89c6ad_48733447f3854c91b87d521e1150d2e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b55a81714a74976b0b84c4e3d273943.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_0dc5687e6ef640c5942caded095c5a3a.pdf
    • https://static.usrfiles.com/ugd/b444d4_53cee629e0cb457e80aafd4cd2162e88.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bac9085c26648988671f031fb50c5b9.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1923/files/mimezu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2260/6759/files/71202547705.pdf
    • https://cdn.shopify.com/s/files/1/0433/7467/4083/files/98309123693.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/gipar.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2056/files/19140994631.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/relowi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/15492005026.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3126/files/jirunenemazivanobesexax.pdf
    • https://cdn.shopify.com/s/files/1/0432/7804/1244/files/76509852741.pdf
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/84646157656.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_off0000841b.bin
582b9e734e9e7dcdd6b06b251c9d91985fe8d39b8faca30a27e3b145d13f2aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x841B 5456 bytes
font_01_sfnt_off00009690.bin
ee00c005dd55b44df6c6422130bff75c0526070776dca4259742dd00802ca318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9690 9916 bytes

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