Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdedbc0666dae4e9…

MALICIOUS

PDF

43.7 KB Created: 2020-09-16 17:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b308035a57be05643e14c833963b78f SHA-1: 258f0b539d68375618d13468e8f731177be70d1f SHA-256: cdedbc0666dae4e93aeb8eb4a1d3a7312bfaa14cfad3042da083bcd6f9185e70
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is 'https://ttraff.me/wix?keyword=metallic+bonding+worksheet+answer+key', which is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, contains references to the same URL and other benign-looking PDF links, suggesting a social engineering attempt to trick users into clicking the malicious link under the guise of accessing an answer key.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.me/wix?keyword=metallic+bonding+worksheet+answer+key
    • https://fb6e8a69-4302-4d22-b2d8-4431da23df78.filesusr.com/ugd/011e4b_1981bc2b91e248abb9a92505f0d3c17b.pdf?index=true
    • https://40429b4b-d855-4b32-aa6b-cea0adbafd6d.filesusr.com/ugd/5bb01c_536037b408f84525b7b23cb12ad997e0.pdf?index=true
    • https://4646cdc3-ee07-4336-87bc-398263c40e4a.filesusr.com/ugd/8e6e76_5b3de03a77234208933858175c6a0082.pdf?index=true
    • https://4283a5f3-b5cf-4013-a278-33486ea7302a.filesusr.com/ugd/735189_7fe16acecbb04cb3a529dbc2c7d6a5c3.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/76728660691.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1786/files/65735801566.pdf
    • https://cdn.shopify.com/s/files/1/0464/1603/6008/files/aggiornamento_android_10_quando_esce.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1782/files/img_viewer_gta_sa.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6777/files/matrix_algebra_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/9744/7836/files/warframe_nezha_build.pdf
    • https://cdn.shopify.com/s/files/1/0436/1800/9250/files/41301299494.pdf
    • https://cdn.shopify.com/s/files/1/0436/8783/7849/files/ecology_of_the_planted_aquarium_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0220/files/30951956197.pdf
    • https://cdn.shopify.com/s/files/1/0433/4072/6427/files/antenatal_care_nice_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/9900/3811/files/acrok_video_converter_ultimate_crack.pdf
    • https://cdn.shopify.com/s/files/1/0469/0522/9474/files/44576435681.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_off00006a83.bin
cd8d25476bcd80a24537091fbcbc9725310039a9db66721fc62cd647dd9bbc8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A83 5604 bytes
font_01_sfnt_off00007dad.bin
2320cb14d5d629c3763e1e7b64c23c6f66e1d33dacdc935bc07b402fa8ed4fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAD 10520 bytes