Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e13e3c99cbd4ff…

MALICIOUS

PDF

54.8 KB Created: 2020-09-16 23:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb3761bb822568836b8e1d99f92b0c52 SHA-1: 7fae1535f9fb421ccb5fb0710cbca80aa934f958 SHA-256: 92e13e3c99cbd4ff3830e5872b9b2296cf023c7db30274e87148437d3fa5c592
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a lure, using a seemingly educational topic to entice users to click on a malicious link, which likely leads to further compromise.

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.link/wix?keyword=physics+electromagnetic+induction+worksheets
    • http://bowawega.cbaofga.com/uploads/1/3/1/3/131380183/rerididuvewof.pdf
    • http://files.juliamorizawa.com/uploads/1/3/0/9/130968967/nogurosuzulobisevot.pdf
    • http://files.westtechmobile.ca/uploads/1/3/2/7/132741385/fipef_lelutifuxen_suxadipa_bovafiw.pdf
    • https://2351e442-3723-4b3f-825c-a1fbc13f988e.filesusr.com/ugd/90661f_ef17a994cf27465195a1d15aed787552.pdf?index=true
    • https://62624e47-4aee-444b-b139-82de88947081.filesusr.com/ugd/b42fd6_2457d535bfb5432da8dcdb008481b2ba.pdf?index=true
    • https://ed9db4e3-4766-4277-a081-0224999d9743.filesusr.com/ugd/18ee90_e63bd8e9ba1a4184bd76c0b962f74ce7.pdf?index=true
    • https://88dbc538-d328-4d96-9d58-d298a70e0ace.filesusr.com/ugd/cfa91a_32fdc1cbab1c40e0b9f62edd1c0362d8.pdf?index=true
    • https://eed85539-51a3-40b6-9885-55a113a05e84.filesusr.com/ugd/6e13d9_6a123018355343eaa08f0995e916ca43.pdf?index=true
    • https://57df78e4-9223-402a-9fd4-f1d6672f1dad.filesusr.com/ugd/cbdbb6_03cfc7775c9e4e3e930e7a8e42a8dc0d.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/4142/2492/files/idol_gu_marksheet_2017.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/xusopidovido.pdf
    • https://cdn.shopify.com/s/files/1/0430/6567/1833/files/wakufixodepaturelogexi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0824/files/linux_administration_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/chiang_mai_visitors_guide.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_off0000965b.bin
03abc8dcb02f71df14c5c3db13da184a6c7a55e3a126a905480740c1ffcdd3f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x965B 5612 bytes
font_01_sfnt_off0000a95e.bin
e1f6b2b41faed50d5c567d23d20259f8c4afe7505729ba47009c3ed783896a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA95E 10892 bytes

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