Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b6ade190ecefc6…

MALICIOUS

PDF

42.3 KB Created: 2020-09-21 06:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b94e160f80ca3da50f5f74932c0f35a5 SHA-1: 0bf29b8e93f2f15b22ec9b19b3c7a7add4104663 SHA-256: 91b6ade190ecefc64ba0dc5153d177cd1e3e2d348f0d0a26abd5a647b9019b88
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL disguised as a manual title. The ML classifier strongly indicates maliciousness. The primary malicious URL is https://ttraff.link/wix?keyword=a+o+smith+commercial+water+heater+manual, which is designed to redirect the user to further malicious content. The presence of numerous benign-looking PDF links on Shopify suggests an attempt to blend in with legitimate content while distributing the malicious payload.

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.link/wix?keyword=a+o+smith+commercial+water+heater+manual
    • http://files.circular-canary.com/uploads/1/3/1/3/131398231/durojoboriruj.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/lelafizugilapuvuwolajuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8475/8696/files/dudedimogupesuxiwimoraje.pdf
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/room_on_the_broom_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/2344/9760/files/85207724822.pdf
    • https://a112fa92-5252-4e53-b2c2-fb77139ed4c8.filesusr.com/ugd/067ecb_2ce96abda0454a078d805ec237b515e8.pdf?index=true
    • https://5b134469-079c-457f-96c6-ac325d9db828.filesusr.com/ugd/529ba0_99713cb550ec4c57aa4d193687d45e13.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/7808/1942/files/batman_arkham_origins_cheats_codes_p.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/fabibatinasazadogaxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9367/8497/files/bertrand_duopoly_model.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/
    • https://cdn.shopify.com/s/files/1/0

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b5.bin
bd8bec18e2832ccdfee0733a5e011f4b29da39b733adecf6badff687c8c060ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B5 5120 bytes
font_01_sfnt_off00007901.bin
95ce20701bdef4d47433f9b4d3efb468f28ce96cfdd2dab26baf0b797572616a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7901 10304 bytes

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