Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4eb44f4767ffa81…

MALICIOUS

PDF

43.8 KB Created: 2020-08-30 14:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b90552e531ce390e23b9ba67ee17c180 SHA-1: d97417e9803deab86322c0ede74d9b2bab96a8d8 SHA-256: f4eb44f4767ffa81ed3d9cd6a07711ea9c9db740482870080f5777315beb9fb3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/wix?keyword=scientific+classification+of+plants+pdf'. Another critical heuristic identified a PDF link farm, with 'https://cdn.shopify.com/s/files/1/0431/2642/3701/files/xemix.pdf' being the first listed. The document body, though heavily corrupted, contains text related to scientific classification and the URLs, suggesting a lure to disguise malicious redirection. No scripts were extracted from this sample.

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.com/wix?keyword=scientific+classification+of+plants+pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/xemix.pdf
    • https://cdn.shopify.com/s/files/1/0435/2383/4024/files/google_chrome_for_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/1466/7934/files/61943188413.pdf
    • https://cdn.shopify.com/s/files/1/0453/2230/5691/files/tojola.pdf
    • https://cdn.shopify.com/s/files/1/0432/5346/5243/files/9149952444.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7335/files/papaziwutuwibesoxid.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9947/files/wurafumolumu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/adjoint_technique_de_recherche_et_de_formation.pdf
    • https://cdn.shopify.com/s/files/1/0450/7323/6131/files/agriculture_chapter_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/avc_arteria_cerebral_media.pdf
    • https://static.usrfiles.com/ugd/defdb4_4c1203b3f6a4441d826a4109aceff509.pdf
    • https://static.usrfiles.com/ugd/b8c837_965c8c0373814048ad8d9eb9b11ac205.pdf
    • https://static.usrfiles.com/ugd/238140_65e3e10409b44f1b9042cbc9c4657d84.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_off00006a68.bin
6dd4699a14208b720bc68d8dc66e3352fd161bcd5bd3375ce935a344ab6c30be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A68 5156 bytes
font_01_sfnt_off00007bf5.bin
57c2aba73a3d1e9d9832fb7f095c4864ae31712febb487c15f27fbd6ec1ab1af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF5 11860 bytes

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