Malicious PDF — malware analysis report

Static analysis result for SHA-256 521238b8e8643325…

MALICIOUS

PDF

39.4 KB Created: 2020-08-27 21:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bca20240c7c354a9626b575682c40c13 SHA-1: cdd6ecc27051442f5d6cea7bbe3ef9fe7dbd2bb2 SHA-256: 521238b8e86433255b09c03f3ff864e0ed931f167d8b0953990ad31d09fa9701
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is related to sheet music, likely a lure. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, further supporting a malicious intent to redirect users. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this file.

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=arabesque+sheet+music+pdf
    • http://files.dovecotemissions.com/uploads/1/3/0/9/130969356/vajan.pdf
    • http://xabexu.montbrae.com/uploads/1/3/1/4/131453050/79072591a65f1.pdf
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/53092315229.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/facebook_ads_guia.pdf
    • https://cdn.shopify.com/s/files/1/0438/4443/6128/files/retajapovuxo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/communication_skills_presentation.pdf
    • https://cdn.shopify.com/s/files/1/0433/9387/6118/files/18480689069.pdf
    • https://cdn.shopify.com/s/files/1/0432/8433/2710/files/84585836614.pdf
    • https://cdn.shopify.com/s/files/1/0432/2036/9567/files/30957020028.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0319/files/gisinamomojilozuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/zubewiwesizozukiba.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/70009089945.pdf
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/8533192656.pdf
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/sexiwinotofivotomakokiwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/87082444259.pdf
    • https://cdn.shopify.com/s/files/1/0435/3648/2458/files/ramowexetif.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/
    • https://cdn.shopify.com/s/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e19.bin
a48c2fc629714d19f86f2d54480a5c70059fc518fd66dde050ba003390bcbb82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E19 5616 bytes
font_01_sfnt_off00006100.bin
268ea6c8b6862df2b3827e49ddec4521db1babe906cd620bce36b796b51ddb53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6100 14524 bytes

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