Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9380adf3f036614…

MALICIOUS

PDF

42.6 KB Created: 2020-08-16 02:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3af21d0b12bed2b7882b2b4e106ba1ce SHA-1: d9658beb39cd8c945b8073bd78ab9c1f61e2e965 SHA-256: c9380adf3f03661443f812a284a65ab5a1e75a68cca6db3921483dd42792f4d5
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a heuristic firing for a malicious redirector link, which is the primary attack vector. The document body, though heavily obfuscated, contains the malicious URL. The presence of numerous external links, many pointing to Shopify, suggests a link farm designed to obscure the malicious destination. The file was generated by wkhtmltopdf, a tool often abused for creating malicious documents.

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.cc/wb?keyword=logical%20positivism%20philosophy%20of%20education%20pdf
    • http://dajakam.westsiouxfallshomes.com/uploads/1/3/1/8/131871622/0f3bfa8308d7e.pdf
    • https://cdn.shopify.com/s/files/1/0448/1895/6449/files/travelling_allowance_rates_for_central_government_employees.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/kiran_psychological_aptitude_test_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/cemento_portland_tipo_1.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/12538061229.pdf
    • https://cdn.shopify.com/s/files/1/0433/7762/3201/files/puguvududitevawin.pdf
    • https://cdn.shopify.com/s/files/1/0432/9711/2219/files/2908684191.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46287179129.pdf
    • https://cdn.shopify.com/s/files/1/0429/0582/9532/files/tuxex.pdf
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/7278923939.pdf
    • https://cdn.shopify.com/s/files/1/0429/0091/4343/files/cuaderno_de_investigacin_en_psicologa_social_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/13319398971.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1621/files/prodigy_p3_brake_controller.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f1d.bin
7b163f0f2273e457ef06140b984bd667b01bbb3c14eac7ece172106c69300d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1D 1584 bytes
font_01_sfnt_off00006728.bin
c5827ec4d2185cfd253b54f86779b76ff1a6a4df4d133a5b1bf8cf4b798cc738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6728 5576 bytes
font_02_sfnt_off00007a12.bin
7f785459063d440277c0e66da8ec447132280f038960bed6e80bf5ea24c1d196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A12 10236 bytes

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