Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadb4587556d2fdb…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 19:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 810119b3a7d750344efb774ae7dcdd8c SHA-1: 8249678cf7261ffe6a75cd12b6fa939f00015326 SHA-256: cadb4587556d2fdb75367559c41e46cee97b1116491ff5d22152e4f4ab447472
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 URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body itself is heavily obfuscated and appears to contain junk data along with some URLs. The primary attack pattern observed is the use of a link farm to potentially redirect users to malicious content or for SEO manipulation.

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=les+phases+de+la+lune+ce2
    • https://cdn.shopify.com/s/files/1/0433/1870/6331/files/9164284864.pdf
    • https://cdn.shopify.com/s/files/1/0432/7528/8732/files/test_de_anorexia_y_bulimia.pdf
    • https://cdn.shopify.com/s/files/1/0440/7338/6136/files/galunasez.pdf
    • https://static.usrfiles.com/ugd/6f9b04_7fbeb8f5ac6d49a2847af1b3ebcada6d.pdf
    • https://static.usrfiles.com/ugd/234f58_bec5dddcca914d9aa0bcee4397319e96.pdf
    • https://static.usrfiles.com/ugd/b8c837_affb6a93945c4d549595d45de0a7bee3.pdf
    • https://static.usrfiles.com/ugd/b8c837_712dbd5c204d4b4094da27ff0538d1a6.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2305/files/nelemonenipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/72821494698.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/thomas_calculus_early_transcendentals_13th.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1974/files/rakan.pdf
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/wuzepiriwazinemalabu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6364/7131/files/55698827337.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6535/files/bluestone_alley_piano_sheet_with_letters.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_off00005f04.bin
04aecdc31093848039a8a065183f58a9dd9255529debf7e013886b84f2c26326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F04 5140 bytes
font_01_sfnt_off0000707a.bin
84f34a305fe7adfd7c9ee8a219525e7f9f5c050c7684c76b6efb5672c2b730ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707A 11760 bytes

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