Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c7e3d9671207a2…

MALICIOUS

PDF

40.4 KB Created: 2020-08-06 19:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc3365b56ff90f371b5ffc1e6e17083f SHA-1: 1c06b029a3c5a1dc609bc4b53bdaf1a3fe796a30 SHA-256: 76c7e3d9671207a2f58ecb977ff2a8efa702205388a829bd2164073721094e11
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text and URLs that suggest a lure to external content. The presence of a malicious redirector URL indicates an attempt to lead the user to a compromised or malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.com/wb?keyword=estenosis%20aortica%20sintomas%20pdf
    • http://files.msgarciaslaterk.com/uploads/1/3/0/8/130814308/4214941.pdf
    • http://files.burchcoveacademy.org/uploads/1/3/0/7/130740573/8390730.pdf
    • http://files.sfabsm.org/uploads/1/3/0/7/130775859/1307895.pdf
    • http://files.msgarciaslaterk.com/uploads/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2564/5211/files/26288509958.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8903/files/teroti.pdf
    • https://cdn.shopify.com/s/files/1/0428/0241/3735/files/curl_post_file.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/loxivope.pdf
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/pipokodemawuwidilapor.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/zetevazezijop.pdf
    • https://cdn.shopify.com/s/files/1/0437/1359/3499/files/nvidia_egpu_mac.pdf
    • https://cdn.shopify.com/s/files/1/0436/7699/1653/files/13908217506.pdf
    • https://cdn.shopify.com/s/files/1/0428/4507/7660/files/classification_of_bacteria_based_on_shape.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/12140874070.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/23580011677.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_off00005d3f.bin
81c2deb91d8bd680c7cf69be898e9e44615578fcc929a99bdc895d66ee52e69b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3F 5228 bytes
font_01_sfnt_off00006ef7.bin
c3a060983b888394a98678ed236498cbcbcc08909bfa1a6c2de95a3c3ab7629c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF7 11140 bytes

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