Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4a78e489aab0fb…

MALICIOUS

PDF

52.4 KB Created: 2020-08-31 03:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83a419d72522712a107cfe00d62f1981 SHA-1: 87e78eb3ebe39f3d97b30d17030e43507700b19d SHA-256: 3c4a78e489aab0fbe296e065f51482db190abfc4a24c14ec179b8854a301edfd
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains this URL and references to a textbook, suggesting a lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents, likely to manipulate search engine results or distribute further malicious content. No scripts were extracted from this sample.

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=microbiology+with+diseases+by+taxonomy+6th+edition
    • https://static.usrfiles.com/ugd/de60da_e03de5df0c37460a806743b4b096e76e.pdf
    • https://static.usrfiles.com/ugd/aff7ca_4c1d868c8b42419a93480512ced1063a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5275f14275f4be9b28eedb7b2fde6de.pdf
    • https://static.usrfiles.com/ugd/67e251_eeb2beaa903d4011a09bc1c859d86ab6.pdf
    • https://static.usrfiles.com/ugd/2486b5_3662fb109cc64aa9aaa8dde434e508de.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/regizuwoxisobes.pdf
    • https://static.usrfiles.com/ugd/b8c837_a237b3e8fcd246cfb4581f8e41c99f53.pdf
    • https://static.usrfiles.com/ugd/6a22cb_1b28389c239d4bc1abe23552125a798d.pdf
    • https://cdn.shopify.com/s/files/1/0431/4490/4855/files/toa_attenuator.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2245/files/52676755363.pdf
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/zesoput.pdf
    • https://cdn.shopify.com/s/files/1/0431/4713/3088/files/gully_boy_full_movie_moviescounter_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/definition_of_behaviorism.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_off00008d17.bin
557b5b368f145130a8d6a453686f3ff47557c0e348d39fff90c1c7da57792272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D17 5916 bytes
font_01_sfnt_off0000a127.bin
390dffe768049a1de0012194636ec14faac7d22f254bf5d048b7945a70db327e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA127 10416 bytes

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