Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f714a80367663d9…

MALICIOUS

PDF

43.3 KB Created: 2020-08-17 07:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d247ccb253cbbcd6d62deff5a5e1a06 SHA-1: 14e7f4ec31093786d93088fe0dea8f78338dafe8 SHA-256: 8f714a80367663d9b3777f96fbf012a4cca5097b399b2079c2543eedec647845
160 Risk Score

Malware Insights

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

The PDF contains a clear social engineering lure, instructing the user to update their Chrome browser on Android. This is supported by the 'SE_BROWSER_INSTALL_LURE' heuristic. The document links to a redirector URL, 'https://ttraff.ru/pify?keyword=cannot+update+chrome+android', which is flagged as malicious. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning or distributing further malicious content.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.ru/pify?keyword=cannot+update+chrome+android
    • http://files.raceworkscoilovers.com/uploads/1/3/1/4/131437846/6695063.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/38250052258.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/36399415131.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7884/files/98703324086.pdf
    • https://cdn.shopify.com/s/files/1/0428/1620/9059/files/jiwuwobufo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/lusuxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/lefaxanetogasanaketema.pdf
    • https://cdn.shopify.com/s/files/1/0433/3666/3208/files/95537100058.pdf
    • https://cdn.shopify.com/s/files/1/0437/1267/5995/files/97128640127.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/vulorisisaxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/73054223544.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f20.bin
c7180f4878e429c4bd174f01055f9f338bcbbe2a95b18e79bd770d9739f2e812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F20 5008 bytes
font_01_sfnt_off00006ff9.bin
031c96593017d214888bb02412f2a07ca61d63107108c4e7c1de39539beb9053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF9 10136 bytes
font_02_sfnt_off0000929b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x929B 4324 bytes

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