Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e7247f0a843b7c…

MALICIOUS

PDF

40.6 KB Created: 2020-08-30 02:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae31149fe150ff89cb89d7a74364c51e SHA-1: 758add9a2d1f36bc0f5101b0123c42f6633b8cb0 SHA-256: a2e7247f0a843b7c89e15d8375b72b7e703f577ff1bf53143df05f9a7b8c52ff
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a mass external link farm, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=parallel+editing+vs+cross+cutting
    • https://static.usrfiles.com/ugd/b8c837_fcd191c090a4461fa5a54edd0783f4d9.pdf
    • https://static.usrfiles.com/ugd/a771bd_78d198cb5f3f4ceb8c73cd4a20f6f035.pdf
    • https://static.usrfiles.com/ugd/11f207_3972d360fd0b4161a22c8e4dca7b9ae0.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/ansys_19._2_help.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7680/files/37548403050.pdf
    • https://cdn.shopify.com/s/files/1/0437/5222/6974/files/anu_b._pharmacy_3rd_year_syllabus.pdf
    • https://static.usrfiles.com/ugd/b8c837_195e3f0534ea465ca49fba8be2f43f65.pdf
    • https://static.usrfiles.com/ugd/0aab01_3b7e98cd1bd94714aacba80cb00d3718.pdf
    • https://static.usrfiles.com/ugd/2b25b5_b3e26c37bcd4499cbc5b826395a08605.pdf
    • https://static.usrfiles.com/ugd/173616_cb0c949cef6d485aa6435ac11a89fa9e.pdf
    • https://static.usrfiles.com/ugd/086daf_9d3c786aa1ed4a56a06aea195df255ad.pdf
    • https://cdn.shopify.com/s/files/1/0436/1070/1981/files/convertir_en_tns.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/vekisikokozo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/zagilimo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9939/7027/files/rajivunowofogokalar.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1450/files/pdf_to_word_converter_application.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_off00006173.bin
a26841c7553b8573c41d16d989192ccb04d26322e03ab7a49c159cd8ac4a8e4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6173 5168 bytes
font_01_sfnt_off00007317.bin
c4b069fd5d6e7a7719fe4a0dc256add9ad9355201db452a5768f0880c1afea4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7317 10040 bytes

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