Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcad2b8947b2e43b…

MALICIOUS

PDF

33.6 KB Created: 2020-08-29 08:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a0f20ca9c4777c6e3d08bf7aa954deb SHA-1: 69c7e9405654d248123dad9d0271756a266e04df SHA-256: bcad2b8947b2e43bfa0e27bd3ef04b040ca150a55788327b98ccab2067bbd5f4
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.me/wix?keyword=workbox+3.0+chile', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of numerous links, including a malicious redirector, suggests an attempt to lure users to malicious sites or to manipulate search engine rankings.

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.me/wix?keyword=workbox+3.0+chile
    • https://static.usrfiles.com/ugd/b8c837_a55c3657c1c346ceb08a8fe36e0100b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_0875eb0304ff4d1c9568b40c750db291.pdf
    • https://static.usrfiles.com/ugd/b8c837_71554124eb744b69b7c2ee187cac80c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f3365360b4b46548114c78add366ef9.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/kufedexulisija.pdf
    • https://cdn.shopify.com/s/files/1/0437/3689/1544/files/tugurapavezepowavow.pdf
    • https://cdn.shopify.com/s/files/1/0437/0061/7381/files/xejaxatu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/52648523108.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/40264712961.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/vebepenuwazudazofis.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1563/files/89622583752.pdf
    • https://cdn.shopify.com/s/files/1/0435/5008/1183/files/nalunawuxosifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/18146304154.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/19425169150.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/99886852348.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gumuwajufutoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7355/2040/files/85620686430.pdf
    • https://cdn.shopify.com/s/files/1/0448/3081/8461/files/sample_filled_appraisal_form_for_test_engineer.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_off000048e6.bin
0fd3a50d6081fbf377f02547e5190a3281c9620e0a3d5cd9f7f180599e882712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48E6 5124 bytes
font_01_sfnt_off00005a64.bin
9e17937bd4606fc3762a0574d99aa96b21c301183a7d8b3cd1db9cee34f20f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A64 9220 bytes

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