Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1c59b7a3ebb767…

MALICIOUS

PDF

49.5 KB Created: 2020-08-14 14:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3ffa492a4904e316364653f33a7be12 SHA-1: ecadc7d03fab3c66b839264039ada0fbd5f2c4e6 SHA-256: ad1c59b7a3ebb76716b789305e35640ea8d5f308cf8aa0b3371d976713b53fef
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, pointing to 'https://ttraff.cc/pify?keyword=translation+reflection+rotation+worksheet+grade+7'. This URL is embedded within the document's body, disguised as an educational worksheet. The PDF also features a link farm heuristic, indicating a large number of external links, many hosted on cdn.shopify.com. 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.cc/pify?keyword=translation+reflection+rotation+worksheet+grade+7
    • http://files.k12voip.com/uploads/1/3/1/4/131410158/9605158.pdf
    • http://files.heathermclaurinart.com/uploads/1/3/1/4/131408432/kusuwojibisi.pdf
    • http://files.hummingbirdchicago.com/uploads/1/3/1/4/131437379/8124b72a93.pdf
    • http://files.starwheelprinters.org/uploads/1/3/1/4/131453188/4b3f2b6480d.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/didolumikakiwejuroba.pdf
    • https://cdn.shopify.com/s/files/1/0448/0348/9954/files/il_paradiso_perduto_milton.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/animals_maroon_5_piano.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/76059521144.pdf
    • https://cdn.shopify.com/s/files/1/0447/4975/0421/files/20466883785.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/81283419213.pdf
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/56698098330.pdf
    • https://cdn.shopify.com/s/files/1/0432/3531/1775/files/80581836451.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/wupaxaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/85474408078.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/12460318361.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_off000082d0.bin
3b0f6a316911a75f8f20cf19cf881d93ecec92cb7809a5df2ff01dec7161c61d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D0 5468 bytes
font_01_sfnt_off00009578.bin
59ef6bff6553178e209184896857fd2d04c7351f2a80c4273a3b5011442d262b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9578 10216 bytes

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