Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f0835cc441bf0d…

MALICIOUS

PDF

37.0 KB Created: 2020-08-18 16:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b92ea6dea9bd3b5181cd08e49204cba5 SHA-1: f52216c10e077ab9d9218dc5689a777e11d034e3 SHA-256: 71f0835cc441bf0da4f00bb846b3c6a332eecef16bac2f5b0503bbfbbae9e29c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that suggests a lure related to a 'consulting casebook PDF'. The presence of a link farm and a redirector indicates an attempt to lead the user to malicious infrastructure, likely for further exploitation or phishing.

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=consulting+casebook+pdf
    • http://dapabitav.southernheights.co/uploads/1/3/1/1/131164250/4d6fbde99b4a.pdf
    • http://files.kennedyseminars.net/uploads/1/3/1/6/131606343/9901438.pdf
    • http://files.catherineluckychang.com/uploads/1/3/1/4/131437725/4996099.pdf
    • http://dases.shefaholistic.com/uploads/1/3/2/6/132695328/aedf3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/66557935437.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/grenfell_saskatchewan_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/5892/8545/files/sample_job_offer_letter.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/25029673391.pdf
    • https://cdn.shopify.com/s/files/1/0435/0771/2155/files/pasobodovijobapiwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3927/7734/files/bubotinezubuwowuxanuvis.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/moluwuzub.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/90962611525.pdf
    • https://cdn.shopify.com/s/files/1/0429/3663/1452/files/riesgo_biomecanico_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2739/files/ziratuletizadapiluli.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/9867410632.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8777/files/jexozusepimasisaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/4092/9957/files/make_directory_python.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050c2.bin
0b1eafba8d106f65b1804206cb2c60ed69e27b888ad99bb569804e1195aecce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50C2 5336 bytes
font_01_sfnt_off000062fc.bin
6ecd5600e8450128a8cdc7795bc0192d8e56344f60f2e5b55c526cec6c4e2fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FC 10628 bytes

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