Malicious PDF — malware analysis report

Static analysis result for SHA-256 e452531be0277c3c…

MALICIOUS

PDF

40.1 KB Created: 2020-08-06 05:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 239f93025b0ee8ad365a51cfc774c247 SHA-1: 825fb32a60828784e1ff4483d658b7ea5ac3f34c SHA-256: e452531be0277c3c2e6e752004f42d0def1cad2afca359a1e53f31bba9e2ee21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body text, though partially corrupted, includes the phrase 'cholecystitis adalah pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=cholecystitis+adalah+pdf
    • http://files.danielrosen-poleartist.co.uk/uploads/1/3/1/6/131637108/sipubenirures-tifam-sulozodojomimu-kezipogepel.pdf
    • http://files.jindabyneyabbies.com.au/uploads/1/3/1/6/131606798/zetut.pdf
    • http://files.volunteerconnectnow.org/uploads/1/3/1/3/131379578/298450.pdf
    • http://xafunaxof.msbconsultancy.com/uploads/1/3/0/8/130873951/wugedejuzunini.pdf
    • https://cdn.shopify.com/s/files/1/0429/0448/6055/files/kibexesafesuzosexaga.pdf
    • https://cdn.shopify.com/s/files/1/0437/4714/7928/files/usabo_past_exams.pdf
    • https://cdn.shopify.com/s/files/1/0437/5481/5640/files/xatugililuloni.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/java_array_copy.pdf
    • https://cdn.shopify.com/s/files/1/0440/3711/1973/files/76977852575.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96704933611.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/punawole.pdf
    • https://cdn.shopify.com/s/files/1/0433/2191/7598/files/wupudawovefad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1597/files/millennium_development_goals_ghana.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39748763391.pdf
    • https://cdn.shopify.com/s/files/1/0432/9340/9438/files/33338439420.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_off00005f6b.bin
195fb9f09b65e442f2ccb8e9cc725babfc40be1a03e4eb140afd0f21ada8c08b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6B 5156 bytes
font_01_sfnt_off000070fc.bin
2b213a445218942c311059546fb779f9b8716fd78a03235c8d46a9509f028234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FC 10144 bytes

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