Malicious PDF — malware analysis report

Static analysis result for SHA-256 435a03e9763eb299…

MALICIOUS

PDF

45.8 KB Created: 2020-08-23 03:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a274a90e35827ead816f4d3aad5addb6 SHA-1: 760518a618c1bea4ab3a60aa623a714bc3d70868 SHA-256: 435a03e9763eb29932ccb58eb6ec36a82840f14a2c3f19d57aa0c6a9a58580fe
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to ttraff.com, disguised as printable worksheets. This indicates a likely attempt to lure users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of numerous links suggests a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/pify?keyword=brain+games+printable+worksheets+for+seniors
    • http://files.angelagoodetaylor.com/uploads/1/3/1/4/131407357/robonodirexoterekan.pdf
    • http://supiwon.the-nature-atelier.com/uploads/1/3/2/6/132682974/takotobabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9820/files/assinatura_digital_adobe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9013/3663/files/convert_html_to_java.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/jukifakewotetuvewuzurimer.pdf
    • https://cdn.shopify.com/s/files/1/0437/3354/9205/files/wuwodefugawif.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/86090705638.pdf
    • https://cdn.shopify.com/s/files/1/0431/3563/1514/files/dizozovokovopipuwun.pdf
    • https://cdn.shopify.com/s/files/1/0436/4170/0505/files/tibegukizo.pdf
    • https://cdn.shopify.com/s/files/1/0444/1587/7287/files/warhammer_40k_codex_4chan.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/once_falling_slowly_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/6041/9989/files/agriculture_de_prcision.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/wupozazobivegefom.pdf
    • https://cdn.shopify.com/s/files/1/0434/6583/4649/files/3gp_movie_download.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_off00006da6.bin
52ab4bf87884a0f91ff6250f377cbd782f7e1dd60efd8aa8cb1059548d58bc44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA6 5660 bytes
font_01_sfnt_off000080c9.bin
add5707adf2a959c60b97d130e517a3c035f522def8f575e822f38999ed966d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C9 12096 bytes

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