Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8638247f82bfee…

MALICIOUS

PDF

40.0 KB Created: 2020-08-29 14:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0efa3f5da31811774123bf2ea0a62cfe SHA-1: 002778c3a3a0f88c33df2a0265fef7f308ab61ed SHA-256: eb8638247f82bfee704053ea7f0d7faa12001f16fa9cdbc51b4d29afa4cce3df
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Haier air conditioner instructions' and the malicious URL. The presence of a link farm suggests an attempt to manipulate search engine results to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

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=haier+air+conditioner+instructions
    • https://static.usrfiles.com/ugd/b8c837_667dfbe41eec4e3195ef6593cafb208b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0bb93717ae547a483ecad8353f8e0f4.pdf
    • https://static.usrfiles.com/ugd/d94ae5_bf8b7f209a8344f496e972b4598df9d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_f93452b4e75f4affa44ca5eb0e7cccdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2a383a491994bdb800dbf6807dcff9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dbb8c5f67c64c6e89d56df9f1fa27d9.pdf
    • https://static.usrfiles.com/ugd/18f527_9441ebc2de5e4a0d89880b551a8df145.pdf
    • https://static.usrfiles.com/ugd/b8c837_74e0458252074051bff3d1f92af7861c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a76236dc6014450881049cea60c599ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_85dec416757f4ded8f25e79c224fa635.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1793/files/materi_aritmatika_sosial_kelas_7_kurikulum_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/tomatenupum.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/ccnp_security_free_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_39b62fde182245a490cdfdb8545c9830.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c38f64e06c6438f9b7e65ccef2aafa4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5696e3f709347e98e4e32ffb672a74c.pdf
    • https://static.usrfiles.com/ugd/b8c837_89251cdc29d5434a9e3aa35958352f26.pdf
    • https://static.usrfiles.com/ugd/b8c837_204e3d82abd8400ea3720132253bfcbc.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_off000054fe.bin
52e755a968c6c8f4ec484dad6326fb2ea59de9962da1e291765e5ba3df5584da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54FE 4860 bytes
font_01_sfnt_off00006582.bin
37d66a607632315af9e86b70f0f5b46330c9e863c21d05dac3c61eeddbbfdd8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6582 14708 bytes

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