Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8bc5329588fb36…

MALICIOUS

PDF

40.6 KB Created: 2020-08-04 07:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e9e1e5ac92d7986c3e13320ba61d55e SHA-1: e4e893a98c250325e3f61a14dc3440e9d80ad024 SHA-256: 3e8bc5329588fb36c78e5817834392f0fd5c8004675ad16b04a35ca58e68f519
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a visible download button lure and a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wb?keyword=save%20pdf%20pages%20to%20separate%20files', which is also flagged as a malicious redirector. The file also hosts a large number of external PDF links, many of which point to benign Shopify domains, suggesting a link farm or SEO poisoning attempt to mask malicious activity. The presence of a LOLBin execution instruction further supports malicious intent.

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.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=save%20pdf%20pages%20to%20separate%20files
    • http://fakapubat.marrymeinlefkas.com/uploads/1/3/2/6/132696414/3847943.pdf
    • http://files.wildphlowerwellness.com/uploads/1/3/0/8/130874467/bikaxijagawe.pdf
    • http://files.mendonillinois.com/uploads/1/3/0/7/130739169/8391233.pdf
    • http://files.clintonbracesmd.com/uploads/1/3/1/4/131410747/9460585.pdf
    • http://files.cooriecurls.com/uploads/1/3/2/6/132681634/040c19a0ce85e.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/77185568082.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/bimaletewodefinofiten.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17673355306.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7427/files/26248370064.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8070/files/pudofedukixevejonefiti.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/letozabugimiridoxew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45251784546.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3701/files/uji_one_way_anova_spss.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/jaxopuzaxowagapa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/lowipoxixim.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/16526780055.pdf
    • https://cdn.shopify.com/s/files/1/0437/3243/5093/files/minecraft_name_generator.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/94360719635.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_off00005f6c.bin
c52c8e5f5f15a27e61b9fc8254b70202c8fcae1080622e53b339d7c64e5be6fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6C 5372 bytes
font_01_sfnt_off000071c9.bin
584f7e551f0b9e79bd8f6b71ace1b8a9eb18df389786515225a6f1bd45d35680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C9 10392 bytes

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