Malicious PDF — malware analysis report

Static analysis result for SHA-256 171e36dd599adb64…

MALICIOUS

PDF

47.5 KB Created: 2020-08-01 06:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03c1f1db70e5cf4d451fde9d31489908 SHA-1: d5a3f9436e0974e812654aeb32ad4da9824ee751 SHA-256: 171e36dd599adb6431169080c77ba09f4e015cfd2305ae21d20386cb9577b916
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass external link farm, with many links pointing to Shopify-hosted PDFs, and a primary link to a known malicious redirector. The document body, though corrupted, contains the text 'How to install github bot to discord' and the malicious URL, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=how+to+install+github+bot+to+discord
    • http://files.kchristianson.com/uploads/1/3/0/9/130969746/5803694.pdf
    • http://files.schillingerbassoon.com/uploads/1/3/2/7/132710678/48b7f3e8859.pdf
    • http://files.guardianwildlifeservices.com/uploads/1/3/1/4/131438137/22022fa4f0e09.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/12243957621.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4016/files/tiropuwunarevigagebok.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/16136954889.pdf
    • https://cdn.shopify.com/s/files/1/0434/5715/1129/files/42876941722.pdf
    • https://cdn.shopify.com/s/files/1/0428/8102/4159/files/87255707321.pdf
    • https://cdn.shopify.com/s/files/1/0433/5065/5129/files/lomutime.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/wexolusiwatug.pdf
    • https://cdn.shopify.com/s/files/1/0431/6227/1898/files/35527027630.pdf
    • https://cdn.shopify.com/s/files/1/0433/4931/1646/files/47308015135.pdf
    • https://cdn.shopify.com/s/files/1/0433/7834/4085/files/datug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3093/7751/files/puwivuxeb.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7243/files/kurugufelolorululogixikod.pdf
    • https://cdn.shopify.com/s/files/1/0434/3637/6231/files/xuguliribowewikekaj.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053a2.bin
878bcbca8d3f733d46dd5fead6138bf156133906e0c00f469e6c5dc689744c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53A2 5160 bytes
font_01_sfnt_off00006522.bin
456bc4bebad52c6a51e2b14e756318b55c221bace64cd0b0f90d28e7597fc2ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6522 12528 bytes
font_02_sfnt_off00008d71.bin
d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D71 16164 bytes
font_03_sfnt_off0000a26d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA26D 4324 bytes

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