Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25ea5ec502b2074…

MALICIOUS

PDF

59.9 KB Created: 2020-08-30 20:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8782649ee8cf558f24d6d7dda7fa4035 SHA-1: 4c5b6ddc11f86cd5d73a98033f4d754d4952105d SHA-256: a25ea5ec502b2074331fa5ed56516fbea4a58929f10a5ed74ea234af4147bf26
128 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a critical heuristic firing indicates a malicious redirector link. The document body, though heavily obfuscated, contains a URL that matches the redirector. This suggests the PDF is designed to trick the user into visiting a malicious website, likely for further exploitation or credential harvesting.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=top+100+vocabulary+words+for+ielts+p
    • https://cdn.shopify.com/s/files/1/0439/5941/9038/files/child_psychology_topics.pdf
    • https://cdn.shopify.com/s/files/1/0429/9679/3503/files/xopoxikeliretigakoju.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/byomkesh_bakshi_full_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/xokoxinemujaserafod.pdf
    • https://cdn.shopify.com/s/files/1/0432/3927/6699/files/35303722136.pdf
    • https://cdn.shopify.com/s/files/1/0431/2154/1277/files/tozesotisopufi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3939/files/vitulobutavigaxibulesewe.pdf
    • https://static.usrfiles.com/ugd/b8c837_8012811e613d4442b9bae7f5fa8b8c84.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_857ee98f2af64987adee5208875b1bcc.pdf
    • https://static.usrfiles.com/ugd/a76634_2486b4f3e44242fab9ac1ba9793b6d4f.pdf
    • https://static.usrfiles.com/ugd/accd1f_23994952b5e84e64a50983c66b2d789d.pdf
    • https://static.usrfiles.com/ugd/cd79e3_e511acdc22494a4e952cb772454d9e6d.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_off0000aab1.bin
c14ef1d9c675477ec2db766a809320d35ba6d0fd0e7d730efd29a86f2a2ddc42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB1 5688 bytes
font_01_sfnt_off0000be30.bin
fe3937e7837a365c8928327b8b9b4f40e863bd41e84afafc63fa20131dfa8b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE30 10696 bytes

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