Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb4c88be2566d3a…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 01:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd01f5d9a9261d92de5ea33bfefcb1b8 SHA-1: 4f26b013e70d24f39edaa880daa219f000b00bea SHA-256: 8cb4c88be2566d3a3025fd83d58782f39303c21f7f00445fbe526952164cc7e9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=indian+building+construction+estimat'. This URL is embedded within the document body, suggesting a social engineering lure related to construction estimates. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious URL is the primary indicator of compromise.

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/wix?keyword=indian+building+construction+estimat
    • https://static.usrfiles.com/ugd/3aee12_01c3dc59d0394824bf93ed55b03462bd.pdf
    • https://static.usrfiles.com/ugd/9219f8_748c2a2fa25540639e8435e18bd50479.pdf
    • https://static.usrfiles.com/ugd/122077_c2d7d831a72f43f6b234616e8890f081.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a21f5c85e794d8d9114d9f97d24ec2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_74942d65a4a642b8b780e8b884f61fd6.pdf
    • https://static.usrfiles.com/ugd/4dd980_c29f65f6fbfb464589a03433a026a02a.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_095b76d1135e44feb6a16d7f04c70b66.pdf
    • https://static.usrfiles.com/ugd/67e251_9daaa70c12d04664ac7e1c497554b777.pdf
    • https://cdn.shopify.com/s/files/1/0428/2646/5436/files/23237405041.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/63209554714.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/app_store_mac_os.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/curso_ilustracion_botanica.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/xuzopudabutazukugi.pdf
    • https://cdn.shopify.com/s/files/1/0454/3496/2088/files/assets_and_liabilities_definition.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/sobonoxijivaduravusoxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/15549768493.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_off000066b1.bin
71c296bca7e9b5ea26bdfa8ddacd0eb6ae56ecff7b005724a6736769bbbcfb90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B1 5336 bytes
font_01_sfnt_off000078b0.bin
4230b390c2f495e52442c4ed3fdcb3d3f0e03f1df1d446705d9ae2a65f77f97b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B0 10304 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.