Malicious PDF — malware analysis report

Static analysis result for SHA-256 533a104d8d333579…

MALICIOUS

PDF

38.9 KB Created: 2020-09-17 09:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98407ef364445a0a750139b1d6bce31f SHA-1: 3f0dc7d3facdb7994f8406249370b40cb3c70d68 SHA-256: 533a104d8d33357910ff7381530563c5425657b87e91f732b3170de155524ea6
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=ir+spectroscopy+worksheet'. The document body, though heavily obfuscated, contains this URL and other links, suggesting a lure to external content. The presence of a PDF link farm heuristic further supports the malicious intent of distributing links. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=ir+spectroscopy+worksheet
    • http://files.emilycaffery.com/uploads/1/3/1/4/131437513/gutofapodofigonuta.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1297/files/boom_beach_mod_apk_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1930/5113/files/88862865612.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/ropesesuxojokixufevoniped.pdf
    • https://cdn.shopify.com/s/files/1/0437/4147/9066/files/bufetiburaweporujixaz.pdf
    • https://663ef6b5-16c3-4ad4-927c-585351cec6a6.filesusr.com/ugd/5f226b_f3a7c784283d4cffba9ddb0ca606f1b7.pdf?index=true
    • https://7b60e24e-b736-4ed7-bed1-6e80f2ca07df.filesusr.com/ugd/6e3131_2041057c1a004c2c9084ad89761a4961.pdf?index=true
    • https://82c5d494-3b43-49dc-814b-816a84488c85.filesusr.com/ugd/41a0b6_f3e837e2483e44a4b4244352907a6f50.pdf?index=true
    • https://dd0b98c4-3225-4410-a87e-294f987f8b13.filesusr.com/ugd/f17c08_200bc11e394f4c41a24d76a7a6e4e27d.pdf?index=true
    • https://433c0597-9a74-4327-891f-d3613d472b58.filesusr.com/ugd/e66789_b120a77ad257434fac83241ce565a359.pdf?index=true
    • https://8a10ced2-0814-49c5-8449-dfd95cb31a38.filesusr.com/ugd/01bc73_f394bd7887074b91b3b6a3975f88df62.pdf?index=true
    • 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_off00005aed.bin
7e27818e35f5bfd70579b3c8947c9bf166762e4183211d0014e0aa0d94023049		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AED 4976 bytes
font_01_sfnt_off00006bf5.bin
ff118eabecaf5bffc87e9d619bfa54b535f68cd76a6b51cb93126b528ef79335		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF5 10224 bytes

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