Malicious PDF — malware analysis report

Static analysis result for SHA-256 051a24adda3c129c…

MALICIOUS

PDF

59.8 KB Created: 2020-08-31 06:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63a1097da53099fa067e735bef76bae1 SHA-1: 1f28e378b6f46be3f6a22bd7e5613d4f5bdf2847 SHA-256: 051a24adda3c129c0e3df5033a36a56f698bbbab1ca23337eac2ab5844f1c5d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a redirector link to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL is a strong indicator of malicious intent, likely for SEO manipulation or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=hakeem+agha+jee
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2190/8640/files/74009176586.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/dopidasuvataremedut.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/capital_markets_authority.pdf
    • https://cdn.shopify.com/s/files/1/0436/7525/4937/files/asvab_arithmetic_reasoning_study_guide.pdf
    • https://static.usrfiles.com/ugd/c3f88d_3e172881da8b4954ac376b517fd5ef60.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_d1bed89d0d194b0daa91b0b7be863740.pdf
    • https://static.usrfiles.com/ugd/b8c837_57ff512707e844248063155b12a8eefa.pdf
    • https://static.usrfiles.com/ugd/b8c837_389e28f9367e4cf89da86e62cfa2bef7.pdf
    • https://static.usrfiles.com/ugd/b98abb_a3e2a659860246198f80292f5d0526ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_12a2c83f2b20499789281d00ed5d31f4.pdf
    • https://static.usrfiles.com/ugd/daca0d_30c993d95ad648d88f152ec2c4f272d2.pdf
    • https://static.usrfiles.com/ugd/9f6a24_bc44f4c6322a44b6b2856889d7c2e0cd.pdf
    • https://static.usrfiles.com/ugd/b5472a_591612170d7a4b4fac32711ecc57513c.pdf
    • https://static.usrfiles.com/ugd/dd4472_7189638fa2704feca57203326dd9f741.pdf
    • https://static.usrfiles.com/ugd/430cb2_827416624b4141c0b19a95973083b63a.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009689.bin
3a9e928163b137c55a249f0973f5c110258d925e648d147a18b2aaa987b82cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9689 4896 bytes
font_01_sfnt_off0000a71c.bin
5d4e4df8ee02d32ed77d9eea510e04e8efdc1a8b67cc386c2f8e5668fe707177		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA71C 10540 bytes
font_02_sfnt_off0000cb37.bin
ed614ff3ac2e387b3dffe3adc8533a73dd514e171fc201cb60d70b5b5a32e0ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 16196 bytes

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