Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5317c372f567f6…

MALICIOUS

PDF

51.7 KB Created: 2020-08-08 15:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ef8d91f77bc7f2b73505207e3751960 SHA-1: 30e6fdf58fe2eff9001fe778535bf8d7c9d42be6 SHA-256: 8a5317c372f567f653cad0ce80289c9ecd242ad38291a224ef20d14fa9ee366b
220 Risk Score

Malware Insights

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

The PDF contains an embedded script payload and links to a known malicious redirector. The document body also contains instructions to copy and paste content into a shell, indicating a social engineering lure to execute malicious code. The embedded script is likely responsible for downloading and executing a second-stage payload from the provided URL.

Heuristics 6

  • 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 script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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=azure+cli+cheat+sheet+pdf
    • http://files.holtzeducationalcenter.org/uploads/1/3/1/3/131382673/likax.pdf
    • http://files.ptwmassage.com/uploads/1/3/1/1/131163635/marizero-vasipes-rasilujeru-dugigelirur.pdf
    • http://files.kellyhowardglass.com/uploads/1/3/1/3/131379540/durureda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27247465441.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/84016243234.pdf
    • https://cdn.shopify.com/s/files/1/0433/6694/0828/files/boundaries_in_dating_henry_cloud_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/jamey_aebersold_maiden_voyage.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/36326194900.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4716/files/american_sign_language_alphabet_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/1778/8830/files/xinibotafupodipuvepiluzu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1819/7912/files/93916556051.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9868/files/72975764055.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/91183768873.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2763/files/4123197443.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/dungeons_and_dragons_manual_del_jugador_5.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/23097528876.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1798/files/cabinet_mission_plan_in_urdu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000c9d8.bin
075732853bbb43dfc5c252f98557daacba08e010fc216fe37c375857da68cd6c		 pdf-embedded-script PDF raw stream script payload at offset 0xC9D8 1612 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s).
font_00_sfnt_off00006c72.bin
e9e729f51f1231ada26ad2b0648b8e5f4b2d93d74d70ffce94fa4a42a4d1c1e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C72 5284 bytes
font_01_sfnt_off00007e6d.bin
434f916d7d6457d1ba30e6db77ccf400e35c87a6299c0244ba765ad2a629c55d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6D 14196 bytes
font_02_sfnt_off0000ac06.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC06 16312 bytes

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