Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba0ff86b7012890…

MALICIOUS

PDF

38.3 KB Created: 2020-09-20 16:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0235be26d6d3961f1eef7f263a4a93a SHA-1: dc32d96dc5911a241d5906fbc9324706a071d0c8 SHA-256: 8ba0ff86b7012890948fe7fc4c71eb3a58885cfa5b2ef59332289a66914982e0
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to an 'answer key' for a chapter on airplane travel, suggesting a social engineering lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, further supporting the malicious intent of directing users to external, potentially harmful, sites. 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.club/wix?keyword=capitulo+11+un+viaje+en+avion+answer+key
    • http://files.okjcl.org/uploads/1/3/2/6/132683040/notovon.pdf
    • https://28f60b83-c766-4b29-b486-9d1a571593a1.filesusr.com/ugd/fd30ac_696243a7dd544760b1414c99c65eccb3.pdf?index=true
    • https://58269e0a-5c05-48c3-8e78-dd6877151c7c.filesusr.com/ugd/bcc0e4_a75d31b74b1441da88b61e79a8236026.pdf?index=true
    • https://2383ab43-bf87-494e-96f3-37bc5e4ee716.filesusr.com/ugd/041b56_a0ec90f44ba34a95a3a83ac857b4e550.pdf?index=true
    • https://c26c580a-9433-42a5-9112-ab2dc8e3f5d5.filesusr.com/ugd/e3325f_854c61e38fb04063a05ea76f1ad11577.pdf?index=true
    • https://6e4cce5b-dc2b-43a9-8dfd-aede82d078e0.filesusr.com/ugd/3eb4bd_6feb07262ccc42788c29f45c460f1d74.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/coolrom_ps1_android.pdf
    • https://cdn.shopify.com/s/files/1/0440/3222/9541/files/building_services_design_management_jackie_portman.pdf
    • https://ae49c269-68e4-4e5f-a4cc-1b9de375e6d1.filesusr.com/ugd/590778_59ec8ef3c57d45dda6676242e2d7c1da.pdf?index=true
    • https://35af373b-09b3-408d-8a47-60018a46fbd7.filesusr.com/ugd/0cd019_adcffb923c30459b8cdbb89e63472b72.pdf?index=true
    • https://9dfbe572-8f89-4de6-a54c-8f7cc0243716.filesusr.com/ugd/ea5d7b_8a4c3a49c20d4db983be8f986ee4e333.pdf?index=true
    • 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_off00005564.bin
4f030aa735aa88f17a6a602c61dbffc76c6630f0c91d071dc42e5de619717d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5564 5164 bytes
font_01_sfnt_off00006723.bin
35320e83d418b240c32b1aa4aa86a931850f6646d0314a128176b01eddc7ee63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6723 11012 bytes

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