Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b3e6d945fadbbe…

MALICIOUS

PDF

42.8 KB Created: 2020-08-31 05:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d21e48d8237bdaec4589d4667b016ab SHA-1: 1a4c13e0aac0a1d84879871799aba1d50adcc345 SHA-256: 21b3e6d945fadbbe1cb650a6f7a8a41d40e3828c369dc8e4eed3574e275874be
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly. The primary malicious IOC is the redirector URL.

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.com/wix?keyword=melanie+martinez+coloring+book+pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0823/files/xomibopakiretawegiwafe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/astaghfar_ki_fazilat.pdf
    • https://cdn.shopify.com/s/files/1/0433/6304/1430/files/39459461271.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4333/files/gepede.pdf
    • https://cdn.shopify.com/s/files/1/0434/4247/1064/files/cbse_class_9_syllabus_2020_20.pdf
    • https://static.usrfiles.com/ugd/b8c837_62918db86f814b9ab2c56ab61585f3c0.pdf
    • https://static.usrfiles.com/ugd/d55797_10a8c763cd2f457eb5cb702cae3f8578.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac9312f5205b4856a04b1b900453e37e.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_38ed2544514648ccbd1f7dcdb740fd67.pdf
    • https://static.usrfiles.com/ugd/b8c837_c29ae1bceaaa479c8e4ea670a18e14fb.pdf
    • https://cdn.shopify.com/s/files/1/0432/4478/1735/files/juzodiveribewakafof.pdf
    • https://cdn.shopify.com/s/files/1/0435/5175/2344/files/fox_sports_thailand_program_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/51176950945.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_off00004f52.bin
12fe209871e859922ce11203a1fd41602034abcc7fb0c03fc853aaeda9314a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F52 5344 bytes
font_01_sfnt_off00006169.bin
e21a63c00f37feeede7a2df849cdd81260f4ea483eb77315ed7c9cde1b157495		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6169 14884 bytes
font_02_sfnt_off0000904f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x904F 4324 bytes

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